across lower edge verso in graphite: Pyramid Lake - 30 by 12 - salt water. N.W. Na - Tufa formation / on Trychite rock
Alfred R. Waud, New Jersey; Charles Isaacs, Malvern, PA; NGA purchase, 2000.
- Snyder, Joel. American Frontiers: The Photographs of Timothy H. O'Sullivan, 1867-1874. Exh. cat. Philadelphia Museum of Art. Philadelphia, 1981: 22.