A statistical skeleton of the Rebbe's correspondence — how many letters, when, in which language, and from where. The frame the book is built on.
Letters per year. The flow climbs from the late 1940s to a peak of 1,056 letters in a single year — 5717 (1957) — then recedes. The 1950s are the heart of the archive.
58% of all letters were written in one decade — the 1950s.
Yiddish concentrates in personal letters and letters to women; detected heuristically, needs calibration.
Median body length (characters) per year, from 5710. Stable around 850–1,000; the dip in 1971–74 reflects the many short telegrams and blessings in vols 29–32.
Almost the entire archive was written from one desk. The place field is sparse and sometimes holds a blessing instead of a city — to be cleaned in a future audit.