Pennsylvania. State College. Mineral Industries Extension Services. Mineral industries extension and correspondence instruction. [publisher not identified].
Chicago Style (17th ed.) CitationPennsylvania. State College. Mineral Industries Extension Services. Mineral Industries Extension and Correspondence Instruction. State College, Pa: [publisher not identified].
MLA (9th ed.) CitationPennsylvania. State College. Mineral Industries Extension Services. Mineral Industries Extension and Correspondence Instruction. [publisher not identified].
Warning: These citations may not always be 100% accurate.