Books by Paul E. Hanson
Pocket Guide to the Insects of Costa Rica
Insects and other arthropods o
Insects and other arthropods of tropical America
Hymenoptera de la región neotr
Hymenoptera de la región neotropical
Hymenoptera of Costa Rica
Systematics and host associati
Systematics and host associations of Ormyrus species (Hymenoptera: Chalcidoidea)