Inscription
Inscribed: Within the print: lower left, Irwin D Hoffman / 1936; in pencil: lwoer left, Drilling in Ore -- ; lower right, Irwin D. Hoffman Imp.
Inscribed: Within the print: lower left, Irwin D Hoffman / 1936; in pencil: lwoer left, Drilling in Ore -- ; lower right, Irwin D. Hoffman Imp.