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Annual report of research and technologic work on coal :fiscal year 1950

Annual report of research and technologic work on coal :fiscal year 1951

Annual report of research and technologic work on coal and related investigations :fiscal year 1952

Report of research and technologic work on coal and related investigations :July 1, 1952 to December 31, 1953

Research and technologic work on coal and related investigations :1954

Published Year

1950-1959 (5) *

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