Reproduced from the original documents in the Houghton Library, Harvard University with the cooperation of the Houghton Library and the Photographic Service of the Harvard University Library.

Reels 31-32: Supplement to the microfilm edition of the Charles S. Peirce papers. Includes manuscripts discovered in 1969 after the original filming of the Peirce collection was completed.

Printed guide (reels 1-30): Annotated catalogue of the papers of Charles S. Peirce / by Richard S. Robin. Amherst : University of Massachusetts Press, 1967.

Guide (reels 31-32): The Peirce papers : a supplementary catalogue / by Richard S. Robin. Filmed at the beginning of reel 31.

Reels numbered on container labels as: 7-7A.