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USA | |
| Beste, Bob (1996) Location Guide for Rockhounds in the United States (2nd ed.) Vol. 2 - Part II - Illinois to North Dakota. |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |
| Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion |