Natural resources

Conservation Through Engineering

Extract from the Annual Report of the Secretary of the Interior

Franklin K. Lane

Conservation Reader

Harold W. (Harold Wellman) Fairbanks

The Holy Earth

L. H. (Liberty Hyde) Bailey

The Rural Life Problem of the United States

Notes of an Irish Observer

Horace Curzon Sir Plunkett

A Review of the Resources and Industries of the State of Washington, 1909

Ithamar Howell