Inscription
on verso, signed by artist, center in graphite: David Plowden 1979; upper left: 679-46; upper right: NEW / PAPER / TEST; center left: 1/5/16 / TEST #2 / same 1 / NEW PAPER; center: Primary Autogenous Crushing Mill / Taconite Plant / Cleveland-Cliffs Iron Co – Palmer Empire Mine / Palmer, Mich.
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