Los Angeles and its Environs in the Twentieth Century: A Bibliography of a Metropolis. compiled under the auspices of the Los Angeles Metropolitan History Project;foreword by Mrs. Fletcher Bowron; edited with an introduction by Doyce B. Nunis, Jr. Los Angeles: Ward Ritchie Press, 1973.  Los Angeles and its Environs in the Twentieth Century: A Bibliography of a Metropolis: 1970-1990, with a directory of resources in Los Angeles County. compiled and edited by Hynda L. Rudd; foreword by Doyce B. Nunis, Jr. Los Angeles: Los Angeles City Historical Society, 1996. Published by the University of Southern California with support from the Southern California Studies Center (SC2) and The James Irvine Foundation.