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Deer. Spencer, Asa, f1.1842.
“56 .». Vindication of claims to certain inventions 321 and improvements in the graphic art. By Asa Spen- ode. cer.
no.7 [New Haven? 18427]
12p. 21.5cm,
Caption title.
At head of title: "Appendix to the American Journal of Science and Arts, vol.xliv, No.1."
Claiming invention of process of mechanical engraving.
Printed buff eo front wrapper preserved.
MR