In California, Ecologists Retrace a Pioneer’s Footsteps. Lassen Volcanic National Park (Calif), California, UNIVERSITY OF CALIFORNIA MUSEUM OF VERTEBRATE ZOOLOGY, PERRINE, JOHN, DIXON, JOSEPH, PATTON, JIM, WILSON, LEO, ANIMALS, GRINNELL RESURVEY PROJECT, Environment, Parks and Other Recreation Areas, Research, National Parks, Monuments and Seashores