TY  - BOOK
AU  - Howden, Henry F.
TI  - Speculations on some beeties, barriers, and climates during the pleistocene and prepleistocene periods in some nonglaciated portions of north America
KW  - Insectos fósiles
N1  - Sobretiro de : Sustematic zoology 12(4):178-201, 1963
ER  -