Slate Deposits and Slate Industry of the United States. Dale, T. N., Eckel, E. C., Hillebrand, W., & Coons, A. Technical Report 275, Govt. Print. Off.,, 1906.
Slate Deposits and Slate Industry of the United States [link]Paper  bibtex   
@techreport{dale_slate_1906,
	type = {{USGS} {Numbered} {Series}},
	title = {Slate {Deposits} and {Slate} {Industry} of the {United} {States}},
	url = {http://pubs.er.usgs.gov/publication/b275},
	number = {275},
	urldate = {2017-10-17},
	institution = {Govt. Print. Off.,},
	author = {Dale, Thomas Nelson and Eckel, Edwin C. and Hillebrand, W.F. and Coons, A.T.},
	year = {1906}
}

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