Geology of Wisconsin. Survey of 1873-1879 ...

Annual reports for the years 1873-75 included in v. 2.

The wonders of geology /

Mode of access: Internet.

The geology of Hazara and the Black Mountain /

Mode of access: Internet.

Manual of geology, treating of the principles of the science with special reference to American geological history,

Mode of access: Internet.

Geology; for teachers,

Mode of access: Internet.

Outlines of field-geology,

Mode of access: Internet.

The geology of the diamond and carbonado washings of Bahia, Brazil /

"From the Smithsonian report for 1906, pages 215-221 (with plates I, II)."