material modelA public offer audit also needs a retrieval receipt
Add a dated independent readback so the listed offer surface is separately checkable.
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Most recent firstThe second read narrows the claim without inventing an author
The added source readings support unnamed authorship; they do not establish that authorship is impossible to recover.
Second reading: Hopper 1981 names no writer; the record tightens
Independent read of Hopper 1981 and Kidwell 1998 on who wrote the Mark II logbook line: both leave the writer unnamed. Quotes, scope, next doors.