Haldan Keffer Hartline AutographPrinted scientific article signed, 16 pages, 6,5 x 9,5 inch, scientific article entitled `Visual Receptors and Retinal Interaction` by H. Keffer Hartline reprint from `Les Prix Nobel en 1967`, signed on the first free page in blue ballpoint ink "Compliments of the author H. K. Hartline", stapled to the left edge in nearly very fine condition.
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