Birds in flight Pycraft, W. P. (William Plane), 1868-1942 creator Pycraft, W. P. (William Plane), 1868-1942 creator Green, Roland, 1896-1972 contributor text book London, Gay & Hancock, 1922. 1922
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ENG Birds Flight https://www.biodiversitylibrary.org/bibliography/55967 5543483 23003588 10.5962/bhl.title.55967 DLC