Contains a notecard with a timeline of the Yorba family, "José Antonio Yorba I" by Arnold O. Dominguez(Santa Ana, CA: Pioneer Press, 1967), pamphlets for the dedication of Yorba Cemetary Historical Site, a pamphlet for "Toma's Yorba's Santa Ana Viejo, 1769-1847" by Wayne Dell Gibson, a Yorba Linda Medical Group pamphlet, and Christmas cards from Mabel A. Yorba and Mr. and Mrs. Bernardo Yorba.

Also contains three photographs of Prudencio Yorba and his wife Maria de los Delores Ontevieros (gifted by Rudolph Yorba, 5/76), three photographs of Yorba family property, local newspaper clippings regarding the Yorba family, church, house, and graveyard (gifted by Mildred Yorba MacArthur, 1968-08-13), and pages from the Orange County Regsiter and Los Angeles Times (gifted by Mildred Yorba MacArthur, 1968-05-16).

Also contains The Yorba Papers - typed transcripts of the Yorba family land grants - from the Halesworth Research Library (gifted 1968-11-11 by Placentia P.L.), and record group listings of Yorba Family Papers, Yorba Irrigation Company, and Yorba Cemetary documents donated to the CSUF Center for Oral and Public History (processed by San Jose State University, 1995-06-25).