There are two copies available (13/10/2017) - one is signed! Please specify if you would like the signed or unsigned when ordering.
'Although a vast number of publications have been written on gold and gold mining in California, there was no single report or treatise on all of the known gold-bearing districts in the state. This bulletin addresses that issue. In this report the principal features of each gold-bearing district are described. The longer district descriptions contain sections on the location and extent, history, geology and character of the ore deposits, a list of mines, and a bibliography. Production figures are given whenever possible.' - The Dectector Prospector