Campbell, M. R. Proceedings of the second Pan American scientific congress: Coal fields of the United States considered as sources of supply for the western hemisphere.
Chicago Style (17th ed.) CitationCampbell, Marius R. Proceedings of the Second Pan American Scientific Congress: Coal Fields of the United States Considered as Sources of Supply for the Western Hemisphere.
MLA (9th ed.) CitationCampbell, Marius R. Proceedings of the Second Pan American Scientific Congress: Coal Fields of the United States Considered as Sources of Supply for the Western Hemisphere.
Warning: These citations may not always be 100% accurate.