In writing his book Thoreau and the Indigenous American (Princeton: Princeton University Press, 1977), Robert F. Sayre assembled a group of research materials that are worthy of preservation in their own right. The materials are of three kinds: (1) photocopies of the eleven original Thoreau notebooks held by the Pierpont Morgan Library, New York City, as M.A. numbers 596 through 606; (2) photocopies of typed and edited transcripts of each of the notebooks, most done as part of a 1930s project centered at Columbia University, New York City, principally supervised by Mary Dobbie, with some sections presented as thesis work to that institution; and (3) bibliographic and related notes generated by Sayre himself. Further information about the use to which these materials can be found in Thoreau and the American Indians (Main PS 3057.I5S2 1977), particularly in the introduction and postscript notes.   The photocopied notebooks are described here as Series I. They contain a record of Thoreau's systematic reading about Indigenous Americans. Each opening appears on one sheet, and the sheets for each notebook have been placed in a binder. The binders are numbered 2 to 12. Notes in the collection indicate there was (and may still be) some confusion in the numbering: the eleven notebooks were with a twelfth notebook labeled "Canada & c." which turns out to be unrelated. It was originally numbered "1".   The second series is composed of the Columbia transcripts followed by Sayre's notecards.