Allsop, T., & Allsop, R. (1853). California and its gold mines: Being a series of recent communications from the mining districts, upon the present condition and future prospects of quartz mining : with an account of the richer deposits, and incidental notices of the climate, scenery, and mode of life in California. London: Groombridge.

Allsop, Thomas, and Robert Allsop. California and Its Gold Mines: Being a Series of Recent Communications From the Mining Districts, Upon the Present Condition and Future Prospects of Quartz Mining : With an Account of the Richer Deposits, and Incidental Notices of the Climate, Scenery, and Mode of Life in California. London: Groombridge, 1853.

Allsop, Thomas, and Robert Allsop. California and Its Gold Mines: Being a Series of Recent Communications From the Mining Districts, Upon the Present Condition and Future Prospects of Quartz Mining : With an Account of the Richer Deposits, and Incidental Notices of the Climate, Scenery, and Mode of Life in California. London: Groombridge, 1853.