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Mechanical drawing problems for high schools, normal schools and vocational schools (1918)
Berg, Edward. [from old catalog], Kronquist, Emil F. (Emil Fritjoff), b. 1882 · Peoria, Ill. : The Manual arts press · leaf 207
2.5 L&3. IP InchI-BEAM … -<t.6S 205 S •OlJO C^liO 3AS£: C.Iron. :^ f=>UNCH C.FK.STeel. ^ = -^Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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