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Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 157
137 MILL FOR MIXING CONCRETE. rr __ O ^ CO u_ ,>-. o LU _i p. h" s 1 1 1 UJ 5" cc e: ri < o u 2 CO i o h- OEngineering
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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