This history of Contra Costa County should prove to be the most complete compilation of local chronicles that has up to this time been offered to the citizens of one of the loveliest counties in the United States. The authenticity of the facts contained in the various articles is as absolute as the utmost care could make it. The data have been procured from the best-known authorities, and the biographical sketches, when completed, were subjected to the most searching examination for verification and correction.