National Wildlife Federation Field Guide to Insects and Spiders and Related Species of North America by 
Firefly Encyclopedia of Insects and Spiders by 
Insects and Other Invertebrates by Collecting and Preserving Insects – A Beginner’s Guide
http://bughunter.tamu.edu/
"Insects are everywhere and they can be found from the hottest deserts to the coldest polar regions. With the abundant supply of these invertebrates, you are sure to be able to collect insects no matter where you live and whatever season you happen to be in. This page will discuss the basics of insect collecting for the beginner and will give you tips on equipment, collecting, pinning, and preserving your collection." It has many excellent photographs of the author out in the field collecting and shows examples of his collection.
The Essig Museum of Entomology
https://essig.berkeley.edu/
"The Essig Museum of Entomology, the collection component of the California Insect Survey, dates to the inception of the CIS in 1940. It houses one of the largest and most active research collections of arthropods in the United States. The collection maintains approximately 4.5 million specimens, primarily from western North America and the northern neotropics. The Essig Museum has always maintained a strong commitment to education and extension. This newly developed Website is an outgrowth of this commitment. Through it, we hope to facilitate access to information on the vast arthropod biodiversity of California and other areas."
