Box 1, folders 1-5. Relates primarily to his activities with the Republican Party, the Progressive Party and to his unsuccessful campaigns for state senator. Letters Written to Bancroft. Arranged alphabetically by name of person or organization. A partial list of correspondents follows the key to arrangement.
Unlisted letters are in a miscellany at the beginning of the file.
Carton 1, folders 1-49. Typed or mimeographed unless noted otherwise. Arrangement is roughly chronological. Includes transcripts, clippings, campaign materials, and other assorted papers concerning Republican Party activities in California. Also includes a record of Bancroft's childhood.