These acetate negatives are copies of glass plate negatives. There is not a date or number reference written on the negatives. An 'AR' [archives] numbering system has been imposed. Up to AR348, there
WPA Land use survey map for the City of Los Angeles, book 3 (San Fernando Valley from Canoga Park District to Van Nuys District), sheet 19. Includes: [Title page and] legend [for Book] no. III; Compos
