Issue for Apr. 1989 incorrectly called vol. 27, no. 4 (should be vol. 26, no. 4); issue for Oct. 1989 incorrectly called vol. 26, no. 8 (should be vol. 26, no. 11). Issues beginning with Jan. 1990 called vol. 95, following the chronology of Coal age.
Supplements accompany some issues.
Formed by the union of: Coal mining (Chicago, Ill.) and: Coal age, continuing the volume numbering of the former.