Inside Out Library
Elements of drawing (1912)
Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 87
66 ELEMENTS OF DRAWING horizontal guide line #2, giving the lower part of the letter thestandard 4-space width.Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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