Natural resources

Postcard picturing Bushkill Falls, the "Niagara of Pennsylvania," addressed to former president Harry S. Truman from Walter von Broock, Sparta, New Jersey, 9/5/54. Part of a postcard booklet containing eighteen postcards. Copyright 1937.

Oil well in North Dakota at night.

Park of the Red Rocks Amphitheatre, Denver, Colorado. Original is oversized and in color.

A coal hydrogenation demonstration plant in Louisiana, Missouri. From: Oscar Chapman Scrapbook

Unidentified workers mine oil shale at an experimental oil shale plant near Rifle, Colorado. From: Oscar Chapman Scrapbook

Conservationists, politicians, and others meet with President Lyndon B. Johnson to discuss the California Redwood trees. Seated, left to right: Secretary of the Interior Stewart Udall; President Johnson; Chief Justice Earl Warren; and Senator Clinton P. Anderson. Second row: Congressman Wayne Aspinall (third from left); Melville B. Grosvenor, President, National Geographic Society (fifth from left); Congressman Don Clausen (third from right); and Oscar Chapman (right). Third row: George Hartzog, Director, National Park Service (right); and Stanley A.

President Lyndon B. Johnson (seated, fourth from left) meets with politicians and conservationists to discuss the California Redwood trees. Seated: Secretary of the Interior Stewart Udall (third from left); Chief Justice Earl Warren (third from right); and Senator Clinton P. Anderson (second from right). Second row: Oscar Chapman (second from right); Congressman Don Clausen (fourth from right); Melville B. Grosvenor, President, National Geographic Society (fifth from right); and Congressman Wayne Aspinall (fourth from left).

Secretary of the Interior Oscar Chapman (center, right) speaks with Antonio J. Bermudez, Director of Petroleos Mexicanos (PEMEX) (center, left), on a plane to the Salamanca Refinery in Guanajuato, Mexico. Also pictured: Bruce K. Brown, Deputy Administrator of the Petroleum Administration for Defense (back to camera, right). All others unidentified.

Secretary of the Interior Oscar Chapman (left) and Antonio J. Bermudez, Director of Petroleos Mexicanos (PEMEX) tour the Salamanca Refinery in Guanajuato, Mexico. All others unidentified.

Secretary of the Interior Oscar Chapman (center, right) talks with Antonio J. Bermudez (center, left), Director of Petroleos Mexicanos (PEMEX), while touring the Salamanca Refinery in Guanajuato, Mexico. All others unidentified.