Daniels, J. (1934). Coal in Washington: Distribution, geology, mining, preparation, uses, and economic value of coal resources of Washington. University of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDaniels, Joseph. Coal in Washington: Distribution, Geology, Mining, Preparation, Uses, and Economic Value of Coal Resources of Washington. Seattle: University of Washington, 1934.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDaniels, Joseph. Coal in Washington: Distribution, Geology, Mining, Preparation, Uses, and Economic Value of Coal Resources of Washington. University of Washington, 1934.
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