Scope and Content Single pocket expanding folder containing ten envelopes, C-1 through C-10, each is labeled as "Book 'C,'" and each containing celluloid prints. C-1. "Cerritos Slough location and topography, by Clark F. Miller, 1907," blueprint and two thin paper prints (1939)C-2. "Contours easterly of San Gabriel River, by A.L. Sonderegger, 1905-06," blueprint and blueline print (undated) C-3. "Traverse of three sloughs, by Henry Hancock, Easterly of San Gabriel River,"...