Geology of the quicksilver deposits of the Pacific slope, with an atlas

The field work of the investigations recorded in this volume occupied nearly the whole of three seasons, beginning in 1883. All the mines might have been examined and the maps colored in a much shorter time, but it was found soon after the examinations were begun that they could not be completed satisfactorily without also solving some important general problems affecting the whole region, and much of the time spent was devoted to these questions.