Postcard from Mabel to Mrs. M. E. Wise, thanking her for her letter, sending her apologies that Mrs. Wise's father is unwell, and promising to explain why she will be unable to visit Boulder, Colorado until February. The front of the postcard features a photograph of two women standing on a large rock inside a dark cavern. Both women are wearing trousers and t-shirts, and the woman on the right has her hair pulled back into small draped turban. They are illuminated by a light from somewhere on the ground, which also reveals the large rock formations on the cave wall behind them. At their feet is a sign that reads, "Visit Cascade Caverns." The name of the cave, "Tobacco Room," is printed at the top of the postcard.

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Gordon "Shorty" Carpenter / 6-7 forward Denver Chevrolets"

Photograph taken for a newspaper owned by the Oklahoma Publishing Company. Caption: "Peter Cook football - Colorado Univ."

Photograph taken for a newspaper owned by the Oklahoma Publishing Company. Caption: "Peter Cook football - Colorado Univ."

Photograph taken for a newspaper owned by the Oklahoma Publishing Company.

Photograph of the National Convention of the National Congress of American Indians in Denver, CO, Nov. 15-18, 1944.

A photograph print showing Chicago, Burlington & Quincy (CBQ) 5127, 2-8-2, Class O-1-A, Keenesburg, CO.

A photograph postcard showing Colorado & Southern (C&S) 69, 2-8-0, narrow gauge, on dismantling train, Silica Branch, near Waterton, CO.

A photograph postcard showing Colorado & Southern (C&S) 69, 2-8-0, narrow gauge, on dismantling train, on Silica Branch near Waterton, CO. Close up of engine and crew removing a bridge girder with train in the distance.

Report issued by the U.S. Bureau of Mines discussing the annual report over the research and technology of coal during 1941. As stated in the foreword, "these investigations increase our fund of exact knowledge on the properties and composition of American coals and lead to better methods in mining, preparing, storing, and utilizing coal" (p. 4). This report includes tables, illustrations, photographs, and a map.

A photograph print showing Denver & Rio Grande (D&RG) 223, 2-8-0 (BLW, class T-12), narrow gauge, Gunnison, CO.

A photograph print showing Denver & Rio Grande Western (DRGW) 278, 2-8-0 (BLW, class C-16), narrow gauge, Gunnison, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 3401, 2-8-8-2, Denver, CO.

A photograph postcard showing Santa Fe 3445, 4-6-2, on Train No. 101, "Centennial State", approaching Denver, CO, 7 cars, 60 mph.