Conditions in the coal fields of Pennsylvania, West Virginia, and Ohio. Hearings before the Committee on interstate commerce, United States Senate, Seventieth Congress, first session, pursuant to S. Res. 105, a resolution to investigate conditions in the coal fields of Pennsylvania, West Virginia, and Ohio.

James E. Watson, chairman.

Economic and social conditions in Puerto Rico : hearings before a Subcommittee of the Committee on Territories and Insular Affairs, United States Senate, Seventy-seventh Congress, second session, pursuant to S. Res. 309, a resolution authorizing an investigation of economic and social conditions in Puerto Rico, Washington, D.C. December 7, 8, 9, and 17, 1942.

Dennis Chavez, chairman of subcommittee.

The economic theory of the location of railways : an analysis of the conditions controlling the laying out of railways to effect the most judicious expenditure of capital /

Mode of access: Internet.

Geologic and water-supply reports and maps : Pennsylvania-New Jersey.

Mode of access: Internet.