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Correspondence with Mac Lane, May-June 1963.

Correspondence to Mac Lane, 21 and 25 April 1966, enclosing 'a draft on the "interpreted" PACT Ω', paginated 1.1-8.2.

Correspondence April-May 1966. Includes Adams's 'Draft 1 on the Bar Construction', 8pp ms.

Correspondence June 1966. Includes Mac Lane's draft 'Comparison of Cobar and Loop Space Construction for the operations of a Steenrod PACT', 9pp ms.

Correspondence July 1966, re Mac Lane's draft.

Correspondence August 1966.

'Draft on the Acyclic-Models Argument', 10 September 1966; untitled 9pp ms note beginning 'My first objective is a fairly good PACT Π(n)'.

Miscellaneous notes.

Includes correspondence 1960 re Mac Lane's drafts of book on homological algebra.

Correspondence 1966 re PACTs.