Control de la infección anquilostomiásica por tratamiento quimioterapéutico masivo en Costa Rica /

by Swartzwelder, John Clyde

Manual de medicina tropical /

by Hunter, George William n. 1902, Hunter, George William n. 1902, Frye, William W., Swartzwelder, John Clyde
Published 1973

Tropical medicine /

by Hunter, George William n. 1902, Hunter, George William n. 1902, Swartzwelder, John Clyde, Clyde, David F.
Published 1976

Bionomics of black flies (Diptera: Simuliidae) in Costa Rica /

by Travis, Bernard Valentine 1907-