The biology and external morphology of bees : with a synopsis of the genera of northwestern america - Stephen, William Procuronoff 1927-2016; Bohart, George Edward 1916-1998; Torchio, Philip F. 1933-2013 (Corvallis, Oregon : Agricultural Experiment Station, 1969)
Keywords: ABEJAS; ABEJAS -- MORFOLOGIA; ABEJAS -- CLASIFICACION