1. Photo 21(19) Reference (shelfmark): Photo 21(19) Title: Heliograph section of a cavalry brigade at work in France. Photographer: Girdwood, Charles Hilton DeWitt Scope & Content: Genre: Historical Events Subjects = heliography; Indian Army in Europe; military (general); military campaigns; military communications Collection Area: Visual Arts Languages: Not applicable Date Range: 1915 Extent: 1 item