The Bethylidae of America North of Mexico

The natural history of the Long Expedition to the Rocky Mountains (1819-1820)

Life on a little-known planet

Wasp farm

The sand wasps

The Man Who Loved Wasps

A Naturalist's Years in the Rocky Mountains

William Morton Wheeler, Biologist

Pioneer naturalists

Cache la Poudre

The comparative ethology and evolution of the sand wasps