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along bottom right in graphite: DAVID BRADSHAW N.G.A. PROOF 1993; lower right verso in graphite: 'PROPAGATION HAZARD'

Marks and Labels

stamped in gray lower right verso : (Graphicstudio U.S.F. and printer's chops) / 1161-6 / (copyright mark) 1993 D. Bradshaw / Graphicstudio, U.S.F.

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