University of California Publications in Zoology Volume XXXV. Editors Charles Atwood Kofoid and Joseph Grinnell. Illustrated throughout with black and white photographs within text. Fold-out colour map of the Lassen section showing the life zones of the region. Large paper copy 27cm x 18cm, with grey paper covers, 594pp. Covers a little tattered at edges and front edge mended with selotape, page corners a bit crushed towards rear of volume but binding tight, pages clean and text bright.