Collins, Charles Dickey, 1872- [from old catalog] · New York, D. Van Nostrand company · leaf 66
UNDEFINED Miscellaneous Symbols CONVENTIONAL SYMBOLS —CROSS-SECTIONS 63 Geological Symbols. — From Report of Committee onCross-sections A. S. M. E., and following those used bythe U. S. Geological Survey. … EARTH ROCK PUDDLE
Drawing-room practice · Mechanical drawing
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