Pleistocene birds in BermudaPublished in Smithsonian Miscellaneous Collections, in 1960, in volume 140, issue 2, pages 1-11Facts and theories concerning the insect headPublished in Smithsonian Miscellaneous Collections, in 1960, in volume 142, pages 1-61
Facts and theories concerning the insect headPublished in Smithsonian Miscellaneous Collections, in 1960, in volume 142, pages 1-61