Page 44-45. A group of mud volcanoes along the southeastern shore of the Salton Sea; subsequently covered by water.
Page 47. Impressive mud volcanoes southeast of Cerro Prieto. Note the person wearing a hat just behind the volcano to the right. Circa 1890s.
Page 49. Map of the Colorado River Delta.
Page 50. A quiescent mud volcano; Cerro Prieto in the background at left. Circa 1902.
Page 54-55. A close-up of the crater of an active mud volcano; Cerro Prieto mud volcano region. Circa 1902.
Page 56. Mud volcano region with Cerro Prieto in the background. Circa 1890s.
THE PHOTOGRAPHS on page 50 and 54-55 are from the Sherman Library, Corona Del Mar. The map is by Don Bufkin. All others are from the San Diego Historical Society’s Title Insurance and Trust Collection.