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Roy Winchester Crum
title
ISBN-13
(ISBN-10)
year of publication
Method of Proportioning Concrete Materials, Screened and Unscreened Gravel
978-O-266-83O35-1
(O-266-83O35-8)
2018
R. C.
·
R. Crum
·
Roy C.
·
Roy Crum
·
Roy W.
·
W.C.
Roy Winderbank