National Geographic : 1944 May
The National Geographic Magazine Ew ing Galloway Shining like Stove Polish, Mammoth Vein's 50-foot Face Reflects the Camera Flash So prized for central heating, this is anthracite, which burns soot-free to a clean ash. Its twisting seams limit machine operations. Shoring-up requires a forest of timbers. These Coaldale, Pennsylvania, miners are pre paring to blast a section of the Nation's thickest anthracite bed (page 576).