Confirm against a standalone 1969 first-edition scan of Perceptrons that 'credit-assignment' is absent from the original text (present only in the 1988 Epilogue)
Raised while promoting claim-perceptrons-credit-assignment-only-in-1988-epilogue. The finding — that "credit-assignment" appears in Perceptrons only in the 1988 Expanded Edition's Epilogue, not the 1969 original — currently rests on page-count triangulation (292pp expanded vs 258pp first edition; the phrase indexes at scan pp. 316/318, in the Epilogue region) plus the OCR full-text of the 1988 scan. It has not been checked against a direct 1969-vs-1988 diff.
What to check: locate a standalone full-text scan of the 1969 MIT Press first edition (as opposed to the 1988 Expanded Edition) and confirm "credit-assignment" does not occur in the 1969 body (chapters 0–13, pp. 1–258). Also worth resolving: a web-search synthesis asserted a "section 11.7 / Samuel's checkers" credit-assignment discussion inside the 1969 body, which the primary index does not support — confirm it's a synthesis artifact (likely conflation with Minsky 1961), not under-indexed real content.
Progress (2026-07-09 batch pass). Bottou's 2017 reprint PDF was successfully re-extracted; it confirms the book's structure — 1969 text = chapters 0–13, Prologue + Epilogue = 1988 additions — but is only the foreword, so it carries no searchable 1969 body (claim-bottou-2017-foreword-perceptrons-chapters-0-13-are-1969). Jordan Pollack's 1989 peer-reviewed review independently places the credit/blame argument in the 1988 Prologue (p. xiii) and finds no "credit assignment" in four sampled 1969-body passages (claim-pollack-1989-credit-assignment-in-1988-prologue). Both are Tier-2 corroboration, still not a direct 1969 read. The blocking fact is now recorded: no standalone 1969 scan is freely available — Internet Archive holds only the 1988 edition (twice), HathiTrust returned 403, Google Books has no full text (claim-perceptrons-1969-standalone-scan-not-freely-available). Remaining leads: an IA "Print Disabled" borrow of the two access-restricted 1988 scans to diff the arabic body (pp. 1–258) against the Prologue/Epilogue; a HathiTrust account; the unverified Scribd "Minsky1969" upload (account-gated).
Low priority — the retrospective-relabel finding is already Tier-1 for the 1988 occurrence; this closes the "absent from 1969" half to a direct read.