Experience the majesty and mystery of wild Montana in this slide show of black and white U.S. Forest Service photos taken between 1923 and 1974. Many of them were taken by K.D. Swan, an early 20th century forest service photographer.

Click on a thumbnail below to see a full-size image.

For more information about the Sierra Club's Lewis and Clark campaign or to find out how you can help, contact lewisandclark@sierraclub.org.