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|All Authors / Contributors:||
Charles A Rigby; South Africa. National Building Research Institute.
|Notes:||At head of title: South African Council for Scientific and Industrial Research. National Building Research Institute.
"Reprint from 'Public works of South Africa, ' vol. X, no. 65, April. 1949, pp. 24-28."
|Description:||2 leaves illustrations 31 cm|
|Responsibility:||by Chas. A. Rigby ... With the compliments of the president, C.S.I.R.|