Twenty-eight volumes of the Rebbe’s published correspondence, measured letter by letter. The statistical skeleton toward the book.
Letters written per year. The volume swells through the 1950s to a peak of 1,056 letters in 5717 (1957) — then settles as the published record thins in the Rebbe’s later years.
Letters gathered in each of the twenty-eight volumes of proofed text. Volume יד (5717) is the fullest single volume, at 582.
A further four volumes — כט–לב (913 letters, 5730–5739) — are held out of this Atlas: unlike א–כח, they survive only as machine-OCR of scans rather than proofed digital text, and will be folded in once clean text is sourced.
Share of each year’s letters written in Yiddish. The public “klali” letters keep Yiddish present throughout; Hebrew is the working tongue of the responsa.
Average letter length per year, in characters of Hebrew text. The early, expansive derush-letters give way to the terser replies of the mass-correspondence years.
The share of each volume’s letters whose printed page is anchored exactly (solid) versus interpolated between anchors (hollow, cite with a glance at the shelf). Volumes ו, ט, טז, יח are the softest ground.
The single clearest change in the record. The wartime cry “l’altar l’Geulah” — immediately, to redemption — closes up to 83% of letters in the early 1940s, then falls silent by 5709 (1949). Rising in its place: the frame of building the vessel — spreading the wellsprings, the inner Torah — which climbs through the 1950s. Redemption is not spoken of less; it turns from something awaited into something made.
Every figure is counted from the machine-readable text of all 11,937 letters. Language is classified by a heuristic on distinctly-Yiddish function words — robust for the public letters, and likely a slight undercount of lightly-Yiddish notes. Page confidence is read from each letter’s own citation record: “exact” where the printed page is fixed by letter number, opening text and order; “interpolated” where it is placed between anchors.
This Atlas covers the twenty-eight volumes of proofed text — 11,034 letters, spanning 5689–5734. It is the skeleton; the flesh is the translation, letter by letter.