284 Calvin vs. Henrietta Coal Mining Co Cambria County Coal Development 366 Coal Coal Coal Coal Coal...April, Gloman's Gas Chart, Criticism of Gilpin County, Gulch Mining in Gilser, H. S., Brakpan Mines,...C Guide. Single Shaft Gulch Mining in Gilpin County Gunsolus, F. H., Use of Explosives in Coal Mines...Kilowatt Hoskin, Arthur J., Gulch Mining in Gilpin County^ 223 Markets for Joplin Ores, 103 Random Thoughts...Syria, Self-Burning Limonite, Pipe Ore, Secondary Link-Belt Co., Portable Coal Loader Lignite, Study |