Bumble Bees of the Eastern United States
by Sheila Colla & others. U.S. Dept. of Agriculture Pollinator Partnership. 2011. 103p. illus. map. SuDoc# A 13.2:B 39/8. purl.fdlp.gov/GPO/gpo13132
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Designed for use as a field guide, this volume fills the needs of melittologists (those who study bees) of all ages for a quick and easy way of identifying the 21 species of bumble bee (genus bombus) most commonly encountered between the Atlantic coast and the Mississippi River. With close-up color photographs, body part diagrams, maps, and charts; beautifully browsable.