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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