While researching my 4th year studio for winter quarter 2012, I discovered that the source of some of my favorite drawings of the Los Angeles Aqueduct is now a Google Books: http://books.google.com/books?id=7yIWAAAAYAAJ
Commissioners, Los Angeles (Calif.). Board of Public Service. 1916. Complete report on construction of the Los Angeles aqueduct; with introductory historical sketch; illustrated with maps, drawings and photographs. Los Angeles Department of Public Service.