The structure and some aspects of development of the onychophoran headPublished in Smithsonian Miscellaneous Collections, in 1959, in volume 137, pages 43-60The birds of Isla Escudo de Veraguas, PanamáPublished in Smithsonian Miscellaneous Collections, in 1959, in volume 139, issue 2, pages 1-27
The birds of Isla Escudo de Veraguas, PanamáPublished in Smithsonian Miscellaneous Collections, in 1959, in volume 139, issue 2, pages 1-27