The Black Hawk Hiking Club's 28th Big Hike took members to Yellowstone National Park and Grand Teton National Park in Wyoming.

The 28th Big Hike slides document the Black Hawk Hiking Club's trip to the Tetons and Yellowstone in 1947.

The 28th Big Hike slides document the Black Hawk Hiking Club's trip to the Tetons and Yellowstone in 1947. These slides were created by Oliver Burkhart.

In 1948, members of the Black Hawk Hiking Club visited Niagara Falls; Gaspe, Quebec; Baxter State Park, Gloucester, Lexington, and Concord in Massachusetts; and Princeton, New Jersey.

The 29th Big Hike slides document the Black Hawk Hiking Club's trip to Gaspe, Quebec in 1948.

The 29th Big Hike slides document the Black Hawk Hiking Club's trip to Gaspe, Quebec in 1948. These slides were created by Oliver Burkhart.

Allies, 1939-1957 and undated, consists of publications from the United Nations and countries that were recognized as part of the Allied powers. Contained within this series are newspapers from multiple Allied nations. Additionally, general publications from the United Nations concerning unified efforts are also included. Most documents were either published in or about the British Empire. Plans for the post-war world are also contained in this series.

On the 30th Big Hike, the Black Hawk Hiking Club went to the Great Sand Dunes National Monument and Mesa Verde National Park in Colorado; Monument Valley Park, Canyon de Chelly National Monument, and Grand Canyon National Park in Arizona; and New Mexico.

The 30th Big Hike slides document the Black Hawk Hiking Club's trip to the Southwest United States in 1949.

The 31st Big Hike took the Black Hawk Hiking Club to the North Shore of Lake Superior. On the trip, members visited Kakabeka Falls, Lake Nipigon, Orient Bay, and Pigeon Falls in Canada; Isle Royale, Michigan; and Devil's Lake, Wisconsin.