Inscription
a) "From Arch Bridges" verso, lower right sheet, graphite, unknown hand.
b) "From Arch Bridges" verso, lower right sheet, graphite, unknown hand.
c) "3-13" upper right margin, pen and black ink, unknown hand. "13" center right margin, pen and black ink, unknown hand. "ARCH BRIDGES" verso, lower left sheet, graphite, unknown hand.
d) "used in Arch Bridges" verso, center right sheet, graphite, unknown hand.
e) "ARCH BRIDGES" verso, lower right sheet, graphite, unknown hand.
Marks and Labels
None.
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