Annual report on mining activities /
Commonwealth of Pennsylvania, Department of Environmental Resources.
APA Citation
Pennsylvania. Dept. of Environmental Resources. (19791994). Annual report on mining activities. Harrisburg: Dept. of Environmental Resources.
MLA Citation
Pennsylvania. Dept. of Environmental Resources. Annual Report On Mining Activities. Harrisburg: Dept. of Environmental Resources, 19791994.
Warning: These citations may not always be complete (especially for serials).