Proceedings of the Xth International Ornithological Congress Uppsala June 1950
Uppsala: Almquist & Wiskell, 1951.
Status: Out of printRing binder. Four major papers: Ernst Mayr: Speciation in Birds; Rudolf Drost: Study of Bird Migration; N. Tinbergen: Recent Advances in the Study of Bird Bekhaviour; and David Lack' Population Ecology of Birds. Dozens of shorter papers. 660 pp. Bound in green library buckram. 660 pages. Very Good. Item #R4103001
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