Three notebooks. Black cardboard covers, sewn binding, one hundred sheets each, ruled narrow. Width six and three-quarter inches, height nine and one-half inches. Manufactured by Mead Products, Dayton, Ohio, lot number unreadable. Purchase price one dollar and forty-nine cents each, based on the price sticker affixed to the back cover of the first notebook, the adhesive of which yellowed and became brittle within the first year of storage.

The first notebook was purchased at a drugstore on Market Street in Youngstown, Ohio, on a Tuesday afternoon in March. The purchaser was a man in his middle fifties, five feet ten inches tall, approximately one hundred and ninety pounds. The pressure of his thumb left a faint oval of oil on the price sticker. The notebook was placed in a canvas briefcase along with a folded copy of the Youngstown Vindicator, a ballpoint pen manufactured by Bic, and a set of car keys attached to a ring bearing the Ford logo. The briefcase was carried to a 2004 Ford Explorer parked on Market Street. The Explorer was driven four point two miles to a house on Oak Hill Avenue. The notebook was removed from the briefcase and placed on a wooden desk in a room on the second floor of the house, where it remained for the next thirty-six months, except when it was carried in the briefcase to various locations around Youngstown and the surrounding Mahoning Valley.

The first entry in the first notebook was written in blue ink, ballpoint, medium point, using the Bic pen. The handwriting was small, precise, with capital letters averaging three-sixteenths of an inch in height and lowercase letters averaging one-eighth of an inch. The entry read: "Subsurface void survey, Youngstown metro area, preliminary findings. Grid coordinates attached. Instruments: GSSI SIR-3000 GPR unit, Geometrics Geode seismograph, AGI SuperSting R8 resistivity meter. All instruments calibrated March 12. Depth readings taken at intervals of fifty feet along grid lines A through M. Soil composition: silty clay overlying shale and sandstone, typical of Allegheny Formation. Target depth: 20-120 feet, corresponding to known Pittsburgh coal seam workings."

The notebook recorded four hundred and thirty-seven depth measurements taken over a period of eight months. The measurements were organized in tables, with columns for grid coordinate, date, time, surface elevation, instrument reading, and adjusted depth. The ink varied in color from dark blue to light blue to black, indicating the use of at least four different pens over the eight-month period. The handwriting remained consistent in size and precision throughout, though the pressure applied to the page increased in the later entries, producing deeper indentations in the paper that could be felt by running a fingertip over the reverse side of each sheet.

The notebook recorded that the largest cavity detected was located at coordinates corresponding to the intersection of Mahoning Avenue and Rayen Avenue, beneath the foundation of the Youngstown Central High School gymnasium. The cavity measured eighty feet in diameter at a depth of forty-seven feet. A follow-up measurement taken six months later, on September 17, showed the cavity had expanded to eighty feet and four inches. The notebook contained a calculation, written in pencil rather than ink, showing that at the observed rate of expansion, the cavity would reach a diameter of eighty-five feet within seven years, at which point the structural integrity of the overburden would be compromised. The pencil marks were smudged in several places, indicating the writer had erased and recalculated multiple times.

The second notebook was heavier than the first by a measurable amount — approximately four ounces, attributable to the three folded maps that had been tucked between its pages. The maps were USGS topographic quadrangles, scale 1:24,000, showing the Youngstown metropolitan area. Red ink had been used to draw circles on the maps, each circle centered on a detected subsurface cavity, with the diameter of the circle proportional to the diameter of the cavity. The circles overlapped in multiple locations, particularly in the area bounded by the Mahoning River to the south, the old Sheet and Tube works to the north, and the interstate to the east. The total number of circles was eighty-three. The maps had been folded and unfolded many times, judging by the wear along the crease lines, which had begun to separate in several places and had been reinforced with transparent tape on the reverse side.

The second notebook also contained copies of letters. The letters were typed on white paper, eight and one-half by eleven inches, and had been cut to fit the notebook by folding or trimming. The first letter was addressed to the Ohio Department of Natural Resources, Division of Mineral Resources Management, dated January 14. It reported the detection of "significant subsurface voids in the Pittsburgh coal seam beneath the Youngstown metropolitan area" and requested "a formal review of mine sealing records and a physical inspection of sealed gallery access points." The letter was three pages long and included a summary table of the largest detected cavities. The second letter, dated February 28, was addressed to the Mine Safety and Health Administration district office in Pittsburgh and referenced the first letter, noting that "no response has been received to my January 14 communication." The third letter, dated April 3, was addressed to the Youngstown city council and was shorter than the first two — one page — with the word "URGENT" typed in capital letters and underlined at the top. The fourth letter, dated May 19, was addressed to "Henderson, Office of the Mayor" and was handwritten rather than typed, suggesting it was composed in the field or in haste. The handwriting in this letter was larger than the handwriting in the notebook entries, with capital letters approaching one-quarter inch in height, and the indentations on the reverse side of the page were deep enough to have torn through the paper in two places.

The third notebook was the most recent and the most heavily handled. The edges of the pages were darkened from repeated contact with fingers. The spine was cracked in three places. Several pages were loose, held in place only by the pressure of the surrounding pages. The ink in this notebook was darker than in the first two, and the handwriting showed signs of acceleration — letters connected more frequently, ascenders and descenders less carefully formed, margins no longer observed. The entries in the third notebook were less systematically organized. Measurements were recorded alongside personal observations, calculations alongside fragments of text that did not appear to be part of any formal record. On page seventeen, beneath a table of cavity expansion rates, the writer had printed: "Rate is not linear. Subsidence will cascade. Recommend evacuation Zone A immediately." On page twenty-three, in ink that appeared to be from a different pen — heavier flow, broader line — the writer had added: "Henderson will not return my calls."

The three notebooks were placed in a cardboard box on March 15, three years after the purchase of the first notebook. The box also contained the folded maps, the typed letters, a collection of photographs showing rock formations and mine entrances, and a laminated identification badge bearing the name "William Miller" and the words "Geological Engineer, Maple Creek No. 4." The box was sealed with packing tape and carried to an attic, where it was placed on the floor next to a box of Christmas decorations and a stack of back issues of National Geographic. The attic was uninsulated. The temperature in the attic ranged from approximately one hundred and five degrees Fahrenheit in August to approximately fifteen degrees Fahrenheit in January. The humidity varied with the weather. Moisture condensed on the cardboard box during winter months and evaporated during summer months, causing the cardboard to soften and the tape to lose adhesion. The box was not opened for three years.

During the period of attic storage, the notebooks recorded nothing, because notebooks do not record information autonomously. They recorded only the physical effects of their environment: the expansion and contraction of paper fibers with changes in humidity, the slow yellowing of the paper due to acid hydrolysis, the accumulation of dust on the top edges of the pages, and the gradual fading of the ink on the pages most exposed to light. The ink on the cover of the first notebook, which had been facing upward and was partially exposed to sunlight through a small attic window, faded more than the ink on the covers of the second and third notebooks, which had been facing downward and shielded from light.

The box was opened on an evening in October, three years after it had been sealed. The person who opened the box was a man in his middle twenties, approximately five feet eleven inches tall, weight approximately one hundred and seventy pounds. He carried the box down from the attic, using both hands, and placed it on the same wooden desk where the notebooks had been written. His fingers left fresh oil deposits on the cardboard, overlaying the older deposits from the person who had originally packed the box. He removed the three notebooks from the box and placed them on the desk in order. He read the first notebook in its entirety, turning each page carefully, applying less pressure than the original writer had applied. He read the second notebook, examining the maps and the letters. He read the third notebook, pausing at page seventeen and again at page twenty-three, where the handwriting was larger and the indentations deeper. The reading took approximately four hours. During this time, the temperature in the room dropped from sixty-eight degrees to sixty-two degrees, and the humidity rose from forty-five percent to fifty-two percent, as recorded by a digital thermometer on the desk. The notebook pages absorbed moisture from the air during this period, expanding by an estimated zero point zero two percent of their total surface area.

After completing the reading, the man sat without moving for twenty-three minutes. His breathing rate, which had been approximately sixteen breaths per minute during the reading, decreased to approximately twelve breaths per minute. The pressure of his hands on the desk surface was not recorded. The expression on his face was not recorded, because notebooks do not have eyes. His emotional state was not recorded, because notebooks do not record emotion. He closed the third notebook and stacked the three notebooks neatly, aligning the edges. He stood, pushing the chair back across the floorboards, producing a scraping sound that vibrated through the desk and into the notebook covers at a frequency of approximately eighty hertz, amplitude decreasing with distance. He left the room. The notebooks remained on the desk, in the dark, at sixty-two degrees Fahrenheit and fifty-two percent humidity. They recorded nothing further, because there was nothing further to record. The information they contained had been transmitted. What happened next was not a matter of physical measurement and therefore lay outside the notebooks' capacity to document.