Scope and Content Single pocket expanding folder containing ten envelopes, C-11 through C-22, each is labeled as "Book 'C,'" and each containing celluloid prints.C-11. "Ordinary high tide line, and mouth of San Gabriel River, by Los Angeles County Surveyor, 1897," blueprint and two negative photostats (undated)C-12. "Coast line and sloughs easterly of the San Gabriel River, Lippincott and Parker, 1904," blueprint and one print (undated)C-13. "US Engineer's map of 1908,"...