(Powell and Hogue) 1979 (QL 475 C3 P68) (California Natural History Guides #44) Field guide and accounts for 600 of the 28,000 known insect species in California.
(Evans and Hogue) 2006 (QL 584 C2 E93 2006) (California Natural History Guides # 88) Identifies more than 500 of California's more conspicuous and colorful beetles using an illustrated key to families of California beetle and color photographs. Species accounts include information on beetle identification, natural history, and distribution.
(US Geological Survey) Part of the Butterflies and Moths of North America (BAMONA) database of verified butterfly and moth records in the United States and Mexico. The database includes dynamic distribution maps, photographs, species accounts, and species checklists for each county in the U.S.
