by W. P. Stephen
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Stone fruit pollination
Propagation of the leaf-cutter bee for a...
Artificial beds for alkali bee propagati...
Pear pollination studies in Oregon
Nesting media for the propagation of lea...
Bumble bees of Western America (Hymenopt...
Proceedings of the First International S...
The design and function of field domicil...
Etiology and epizootiology of chalkbrood...
Effects of temperature and other abiotic...