Report on Artesian Basin of Livermore Valley 1907
Supplementary report 1912
Report on the Geological and Chemical Conditions at the Site of the Proposed Reservoir for the City of Antioch 1922
Report to the Board of Trustees, Knights of Pythias Home... on Water Supply for the Home, with related correspondence 1929
Report on the development of a water supply for the Underwood Ranch, prepared for A. J. Molera, with related correspondence and papers 1930
Reports on water and soil of Castroville Ranch prepared for A. J. Molera, with related notes 1930-1931
Report for Mr. L. B. Quimby re possible well, near Lafayette, California 1936
Report on the Commonwealth Claims, Alaska, with related material 1937
Report on the Victory Mine, with related notes and clippings 1948
Report to Mrs. David Butler on the Topography, Geology and Chemical Features of Section I, Township 20 North, Range 4 East ... about 10 miles above Oroville, California 1957
Kilkenny, T. D.: Preliminary Report on Additional Water Supply for City of Vallejo, prepared with assistance of the Tibbetts 1920
Tibbetts, Frederick Horace: [Reports on Alkali Investigations for the Meek Estate] (with cooperation of Sydney A. Tibbetts, with related correspondence and notes 1926,1929
Tibbetts, Frederick Horace: Report...on Appraisal of McArthur Ranch (with cooperation of Sydney A. Tibbetts) 1923
Hammatt, W. C.: Report of investigation of Water Requirements for Irrigation of McArthur Ranch, Shasta County, California 1923
Correspondence and legal Papers in suit for water rights to Adam Springs, Lake County, Prather vs. Hoberg, in which S. A. Tibbetts was witness 1932-1940
Soil and water analyses, including calculations, correspondence and analyses 1916-1947
Soil and water analyses (not by Tibbetts)
Miscellaneous accounts