Scope and Content "The Aliso St. Bridge, over the Los Angeles River, City of Los Angeles, Lloyd Aldrich, City Eng'r.," blueprint plan of proposed Aliso St. Viaduct (1937)"Proposed Grades of Aliso Street Viaduct and Mission Road Underpass, City of Los Angeles, Lloyd Aldrich, City Engineer," blueprint showing elevation and cross sections of viaduct piers and roadbed, as well as cross sections of test holes showing soil types (1937)Blueprint "Los Angeles & Salt Lake Railroad Company,...