Eighteenth annual report of the United States Geological Survey to the secretary of the interior 1896-97 : in five parts.

by Walcott, Charles D. 1850-1927
Published 1897

Twenty-second annual report of the United States Geological Survey to the secretary of the interior 1900-01 : in four parts.

by Walcott, Charles D. 1850-1927
Published 1901