Revision history for U.S. Geological Survey Circular 1478 By John D. Thompson, Donald E. Dennerline, Dawn E. Childs, and Patrick G.R. Jodice Cooperative Fish and Wildlife Research Units Program—2020 Year in Review ----------------------------------------------------- Posted online February 26, 2021 ----------------------------------------------------- Revised and reposted March 4, 2021, as version 1.1 An incorrect image for Ryan Gary on page 5 was replaced with the correct image.