This collection consists of approximately 300 architectural drawings. Most of the drawings are of proposed and approved hotels and residences for Yellowstone National Park, circa 1890-1830. About 80% of these drawings and blueprints are by architect, Robert C. Reamer. Drawings depict from building elevations to plans for windows and doors inside the buildings.

This collection consists of architectural drawings from 1912 by G.H. Carsley and Cass Gilbert. The designs are for the Placer Hotel located in Helena, Montana.