Coal balls

Textures and conditions of formation of Middle Pennsylvanian coal balls, central United States

Thomas W. Perkins.

Fossil peat of the Illinois basin: a guide to the study of coal balls of Pennsylvanian age

Tom L. Phillips, Matthew J. Avcin, Dwain Berggren.

Occurrence and significance of marine animal remains in American coal balls

by Sergius H. Mamay and Ellis L. Yochelson.

A nevv, cheape and delicate fire of cole-balles: wherein seacole is by the mixture of other combustible bodies, both sweetened and multiplied. Also a speedie way for the winning of any breach: with some other new and seruiceable inuentions answerable to the time.

Plat, Hugh Sir

A structurally preserved, Lower Pennsylvanian flora from the New Castle Coal Bed of Alabama

by Richard B. Winston and Tom L. Phillips.

Geologic investigation of roof and floor strata: longwall demonstration, Old Ben Mine no. 24 : prediction of coal balls in the Herrin coal : final technical report, part 2

Philip J. DeMaris ... [et al.].

Geologic investigation of roof and floor strata: Longwall demonstration, Old Ben Mine no. 24 : final technical report, no. 1

by Robert A. Bauer and Philip J. DeMaris

Coal balls as an index to the constitution of coal

by James M. Schopf

Zhongguo mei he zhi wu

Wang Shijun ... [et al.] zhu = Fossil plants from coal balls in China / Shijun Wang ...[et al.].

A new fertile Schizaeaceous fern from Middle Pennsylvanian Iowa coal balls

R. William Baxendale and Robert W. Baxter.