upper left in pen and brown ink over red colored pencil: N.; lower right in pen and brown ink: Humphries' Ledge & Moat Mt. Aug. 27-60-P.M.; by unknown hand along left edge verso in graphite: APG19252D.101
- Ross, Zachary D. Charles De Wolf Brownell: A Decade of Travel, 1856-66. Exh. cat. Hirschl & Adler Galleries, Inc., New York, 2004: 22, no. 71.