No freely accessible standalone scan of the 1969 first edition of Perceptrons could be located; major repositories hold only the 1988 Expanded Edition

A systematic search on 2026-07-09 failed to locate any freely accessible, independently-readable full-text scan of the 1969 MIT Press first edition of Minsky & Papert's Perceptrons (as distinct from the 1988 Expanded Edition). A direct Internet Archive catalog query for title:(Perceptrons) AND creator:(Minsky) returned exactly two items — perceptronsintro0000mins and perceptronsintro00mins — both catalogued as the 1988 edition ("Perceptrons: an introduction to computational geometry"); no 1969-dated item appears in the catalog under that search. A HathiTrust catalog search returned HTTP 403 on both attempts (unresolved either way). Google Books lists only "about" pages, with no full-text preview, for the 1969 printings. A Scribd upload titled "Minsky1969 – An Introduction to Computational Geometry" exposes only a 9-page fragment with no provenance confirming it is a genuine 1969 scan, and was not used as evidence.

This is a negative search finding — a report of what could not be found, not a positive claim about the book's contents. Its significance is that it fixes the residual gap in the vault's Perceptrons work: the assertion that "credit-assignment" is absent from the 1969 body (claim-perceptrons-credit-assignment-only-in-1988-epilogue) still rests on triangulation against the 1988 edition rather than a direct 1969-vs-1988 text diff, because the artifact needed for that diff does not appear to exist in any open repository. The most direct remaining path — an Internet Archive "Print Disabled" borrow of the two access-restricted 1988 scans, or a HathiTrust account — is routed at question-verify-perceptrons-1969-credit-assignment-absent.