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Marshall, William. 1872. Ueber die knoechernen Schaedelhoecker der Voegel. Niederländisches Archiv für Zoologie 1: 133-179, pls. XI-XII. [Darwin Pamphlet Collection 750]
Marshall, William. 1871. Sur les plumes caudales allongées des oiseaux de paradis. Archives Néerlandaises des Sciences Exactes et Naturelles 6: 296-304. [Darwin Pamphlet Collection 753]
Allen, Joel Asaph. 1872. Notes of an ornithological reconnaissance of portions of Kansas, Colorado, Wyoming, and Utah. Bulletin of the Museum Comparative Zoölogy at Harvard College, in Cambridge 3, no. 6: 113-183. [Darwin Pamphlet Collection 780] |
