KEKULÉ VON STRADONITZ FRIEDRICH AUGUST (1829-1896)
P.A.S. "Aug. Kekulé"; 1 page in-8 in pencil under passepartout.
Album page with a sketch and three chemical formulas on the circular structure concerning carbon compounds (Kekule discovered the tetravalence of carbon).
A pencil note indicates that this sheet is from a sketchbook by the German-Russian chemist Otto Nikolaus WITT (1853-1915).
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