Maker's Mark/Inscription: "Study No.6 Rocks" typed, "Petrified Forest" written in ink, on blue sticker on verso; " W.R. Leigh Black Forest, Holbrook Arizona, Feb. 1921" written in pencil on verso; copywrite symbol in pencil on verso
Inscribed in ink, "Study No.6 Rocks" typed, "Petrified Forest" on label on verso; Inscribed in pencil, "W.R. Leigh Black Forest, Holbrook Arizona, Feb. 1921" on verso
