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6 results returnedAnnual 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
Analyses of tipple and delivered samples of coal :collected during fiscal year 1954
Analyses of tipple and delivered samples of coal :collected during fiscal year 1955
Evaluation of an acid-extraction method for determining mineral matter in American coals
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