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I [Wünsch, C. E.] H-B II, 10077 Christian Ernst Wünsch (1744–1828) was a German physician and mathematician known for his research on color theory. "H-B" is likely a library shelfmark abbreviation, possibly for "Haupt-Bibliothek" (Main Library).
II [Snell, C. W.] H-B IV, 3051 Christian Wilhelm Snell (1755–1834) was a German philosopher and educator who wrote influential textbooks on Kantian philosophy.