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Roy Winchester Crum

2 cilt bulundu.

Cilt sonuçları

Method of proportioning concrete materials--screened and unscreened gravel

Method of proportioning concrete materials--screened and unscreened gravel

Roy Winchester Crum · Iowa State College of Agriculture and Mechanic Arts

56 sayfa · 1921

Concrete / Gravel

CulvertsField inspection of concrete pipe culvertsRoy Winchester Crum

Field inspection of concrete pipe culverts

Roy Winchester Crum · Iowa State College

32 sayfa · 1930

Concrete Pipe / Culverts