Douglass, D. B. (1838). Major Douglass' report on the coal and iron formation of Frostburg and the upper Potomac,in the states of Maryland and Virginia. s.n.
Chicago-Zitierstil (17. Ausg.)Douglass, David Bates. Major Douglass' Report on the Coal and Iron Formation of Frostburg and the Upper Potomac,in the States of Maryland and Virginia. S.l: s.n, 1838.
MLA-Zitierstil (9. Ausg.)Douglass, David Bates. Major Douglass' Report on the Coal and Iron Formation of Frostburg and the Upper Potomac,in the States of Maryland and Virginia. s.n, 1838.
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