6 public-domain matches

Effigy Mounds

Cover of The Serpent mound, Adams County, Ohio

The Serpent mound, Adams County, Ohio

E. O. Randall

Cover of Effigy mounds in northern Illinois

Effigy mounds in northern Illinois

Theodore Hayes Lewis

Cover of [Prehistoric America]

[Prehistoric America]

Stephen D. Peet

Cover of History of the World's Fair

History of the World's Fair

Benjamin Cummings Truman

Cover of Indian Mounds of Wisconsin

Indian Mounds of Wisconsin

Robert A. Birmingham, Amy L. Rosebrough

Cover of Spirits of Earth

Spirits of Earth

Robert A. Birmingham