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The General notebooks include chiefly geological and paleontological papers not concerning Michigan.

(also titled Scientific papers: consisting of miscellaneous scientific investigations not including the natural history of Michigan since 1858, nor anything in the character of field notes)

(former v. 188)

The "Michigan" notebooks include most of Winchell's writings on topics relating to Michigan.

(also titled The natural history of Michigan: being a digest of observations made at various times since 1858)

The "Popular" notebooks include Winchell's writings relating to religion, evolution, and education (including geological education). Vol. 16 of this last group (Box 14) includes collected historical materials on the University Musical Society.

(also titled Miscellaneous papers: consisting or essays, addresses and letters on various subjects not of a scientific character)