Cambrian

Walcott, C.D., 1916, Cambrian geology and paleontology III; No. 3, Cambrian trilobites: Smithsonian Miscellaneous Collections, v. 64, p. 303-570.

Walcott, C.D., 1916, Cambrian geology and paleontology III; No. 3, Cambrian trilobites: Smithsonian Miscellaneous Collections, v. 64, p. 157-258.

Walcott, C.D., 1915, The Cambrian and its problems in the Cordilleran region, in Problems of American Geology - A series of lectures dealing with some of the problems of the Canadian Shield and of the Cordilleras, delivered at Yale University on the Silliman Foundation in December, 1913: New Haven, Conn., Yale University Press, p. 162-233.

Walcott, C.D., 1914, Cambrian Geology and paleontology, III; No. 2--Pre-Cambrian Algonkian algal flora: Smithsonian Miscellaneous Collections, v. 64, p. 77-156.

Walcott, C.D., 1912, Cambrian Brachiopoda: U.S. Geological Survey Monograph 51, 2 vols., Part 1, Text, 872 p.; Part 2, Plates, 363 p.

Walcott, C.D., 1912, Cambrian Geology and paleontology II; Middle Cambrian Branchiopoda, Malacostraca, Trilobita, and Merostomata: Smithsonian Miscellaneous Collections, v. 57, p. 145-228.

Walcott, C.D., 1910, Cambrian Geology and paleontology II; Abrupt appearance of the Cambrian fauna on the North American continent: Smithsonian Miscellaneous Collections, v. 57, p. 1-16.

Walcott, C.D., 1908, Cambrian Geology and paleontology I, No. 3; Cambrian Branchiopoda, Malacostraca, Trilobita, and Merostomata: Smithsonian Miscellaneous Collections, v. 53, p. 53-165.

Walcott, C.D., 1905, Cambrian Brachiopoda; with descriptions of new genera and species: U.S. National Museum Proceedings, v. 28, p. 227-337.

Walcott, C.D., 1903, Cambrian Brachiopoda: Acrotreta; Linnarssonella; Obolus; with descriptions of new species: U.S. National Museum Proceedings, v. 25, p. 577-612.