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Dear Mr. Pringle,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located three series Aerial Photography of the Soil Conservation Service, 1934-1954; Index to Aerial Photography of Marin County, California 1942; and Indexes to Aerial Photography of the Sonoma - Napa - Marin Area Project in the Records of the U.S. Soil Conservation Service (Record Group 114). Some RG 114 aerial photographs are digitized and available on the Catalog for you to view, but may not pertain to those that you are seeking.
For access to and/or copies of aerial photographs of Marin County with that specific flight code, please contact the National Archives at College Park - Cartographic (RDSC) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!