#library stamps
Circulation slip, with checkouts between and 1977 and 2006.
From the back matter of A Theory of Pure Design: Harmony, Balance, Rhythm by Denman W. Ross (1907). Original from Harvard University. Digitized March 7, 2007.
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Stamp spectrum.
From p. 289 of Les Eaux Minérales de Sainte-Claire à Clermond-Ferrand by Henri Lecoq (1831). Original from Lyon Public Library. Digitized July 18, 2011.
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