Black porous-tip pen on dark ivory paper
Sheet: 18 x 23 5/8 in. (45.7 x 60 cm)
Inscribed at lower leftt in black porous-tip pen: "HARD ROCK DRILLER / 4 TON BIT"; at lower center: "ROCK FINISHER 68' DEEP / LEVEL TOP OF ROCK"; at lower right of center: "CLAM SHELL DIGGER"; at lower right in graphite: "7/31/69"; verso: blind stamp in gray ink at lower left: "The Estate of RICHARD WELLING"
Gift of the Richard Welling Family
Due to ongoing research, information about this object is subject to change.