1. Photograph of Henry Woodruff Collection: Early 20th Century Engineering Lantern Slides Date: undated Format: Image Agent: unknown
2. Photograph of Maxim Gorky Collection: Early 20th Century Engineering Lantern Slides Date: undated Format: Image Agent: unknown
3. Photograph of the two sons of Carl Bohnen Collection: Early 20th Century Engineering Lantern Slides Set: H. I. M. (Human Interaction Management) Date: undated Format: Image Agent: unknown
