Fissure springs:—

A. C. Peale. Natural Mineral Waters of the United States, 14th Ann. Rept. U. S. Geol. Surv., Pt. ii, 1894, pp. 49-88.

William H. Hobbs. The Newark System of the Pomperaug Valley. Connecticut, 21st Ann. Rept. U. S. Geol. Surv., Pt. iii, 1901, pp. 91-93.

Artesian wells:—

T. C. Chamberlin. Requisite and Qualifying Conditions of Artesian Wells, 5th Ann. Rept. U. S. Geol. Surv., 1885, pp. 131-173.

Hot springs and geysers:—

A. C. Peale. Yellowstone Park, Thermal Springs, 12th Ann. Rept. Geol. and Geogr. Surv. Ter. (Hayden), Pt. ii, Sec. ii, pp. 63-454 (many plates and maps).

W. H. Weed. Geysers, Rept. Smithson. Inst., 1891, pp. 163-178.

Arnold Hague and W. H. Weed (on hot springs and geysers of Yellowstone National Park), C. R. Cong. Géol. Intern., Washington, 1891, pp. 346-363.