coal seams

You have access
On the occurrence of a quartz bowlder in the Sharon coal of northeastern Ohio
Edward Orton

American Journal of Science July 1892, s3-44 (259) 62-63; DOI: https://doi.org/10.2475/ajs.s3-44.259.62
You have access
On the parallelism of coal seams
John Strong Newberry

American Journal of Science April 1874, s3-7 (40) 367-369; DOI: https://doi.org/10.2475/ajs.s3-7.40.367
You have access
On some questions concerning the coal formations of North America
Leo Lesquereux

American Journal of Science May 1863, s2-35 (105) 375-386; DOI: https://doi.org/10.2475/ajs.s2-35.105.375

Main menu