1. Quaternary geology of Northern Sacramento County, California;Shlemon;Geol. Soc. Sacramento Ann. Field Trip Guidebook,1967
2. Soil Survey of the Sacramento Area, California;Cole;USDA Series 1941,1954
3. Geology and ground-water resources of Sacramento Valley, California;Bryan,1923
4. Radioactivity of a California terrace soil;Hansen;Soil Science,1970