Positions Assumed by Birds in Flight. An original article from the Report of the Smithsonian Institution, 1911.
Smithsonian Institution, 1911. First Edition. Disbound. 7 Pages. Note; this is an original article separated from the volume, not a reprint or copy. Size: Octavo (24 x 16 cms). Quantity Available: 1. Category: Smithsonian Institution; Inventory No: 201050. More