This primary source comes from the Collection RN-WHPO: White House Photo Office Collection (Nixon Administration).
National Archives Identifier:
194287Full Citation: Photograph WHPO-C0868; Richard M. Nixon in Motorcade during the 1968 Presidential Campaign; 1968; Nixon White House Photographs, 1/20/1969 - 8/9/1974; Collection RN-WHPO: White House Photo Office Collection (Nixon Administration); Richard Nixon Library, Yorba Linda, CA. [Online Version, https://www.docsteach.org/documents/document/nixon-motorcade, April 24, 2024]