(1949). Investigation of the Benjamin Franklin graphite mine (government owned) and the Just graphite mine, Chester County, Pa. / by Robert S. Sanford and Frank D. Lamb.
Citación estilo ChicagoInvestigation of the Benjamin Franklin Graphite Mine (government Owned) and the Just Graphite Mine, Chester County, Pa. / by Robert S. Sanford and Frank D. Lamb. 1949.
Cita MLAInvestigation of the Benjamin Franklin Graphite Mine (government Owned) and the Just Graphite Mine, Chester County, Pa. / by Robert S. Sanford and Frank D. Lamb. 1949.
Warning: These citations may not always be 100% accurate.