(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.
Tohutoru Kātū Chicago (17th ed.)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. 1949.
Tohutoro MLA (9th ed.)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. 1949.
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