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USA | |
| Geyer, Alan R. , Smith II,Robert C., Barnes, John H. (1976), Mineral Collecting in Pennsylvania, Page 218-219 Rose, A. W. (1970) Atlas of Pennsylvania's Mineral Resources - Metal mines and occurrences in Pennsylvania. Mineral Resource Report M50-3, Pennsylvania Geological Survey. Preston E. Hotz (1950), Diamond-drill exploration of the Dillsburg magnetite deposits, York County, Pennsylvania |
| Geyer, Alan R. , Smith II, Robert C., Barnes, John H. (1976), Mineral Collecting in Pennsylvania, Page 218-219 |
| Rose, A. W. (1970) Atlas of Pennsylvania's Mineral Resources - Metal mines and occurrences in Pennsylvania. Mineral Resource Report M50-3, Pennsylvania Geological Survey. Preston E. Hotz (1950), Diamond-drill exploration of the Dillsburg magnetite deposits, York County, Pennsylvania |
| Rose, A. W. (1970) Atlas of Pennsylvania's Mineral Resources - Metal mines and occurrences in Pennsylvania. Mineral Resource Report M50-3, Pennsylvania Geological Survey. Preston E. Hotz (1950), Diamond-drill exploration of the Dillsburg magnetite deposits, York County, Pennsylvania |
| Geyer, Alan R. , Smith II, Robert C., Barnes, John H. (1976), Mineral Collecting in Pennsylvania, Page 218-219 |
| Rose, A. W. (1970) Atlas of Pennsylvania's Mineral Resources - Metal mines and occurrences in Pennsylvania. Mineral Resource Report M50-3, Pennsylvania Geological Survey. Preston E. Hotz (1950), Diamond-drill exploration of the Dillsburg magnetite deposits, York County, Pennsylvania |
| Geyer, Alan R. , Smith II,Robert C., Barnes, John H. (1976), Mineral Collecting in Pennsylvania, Page 218-219 |
| Geyer,Alan R. , Smith II,Robert C., Barnes, John H. (1976), Mineral Collecting in Pennsylvania, Page 218-219 |
| Rose, A. W. (1970) Atlas of Pennsylvania's Mineral Resources - Metal mines and occurrences in Pennsylvania. Mineral Resource Report M50-3, Pennsylvania Geological Survey. Preston E. Hotz (1950), Diamond-drill exploration of the Dillsburg magnetite deposits, York County, Pennsylvania |
| Geyer, Alan R. , Smith II, Robert C., Barnes, John H. (1976), Mineral Collecting in Pennsylvania, Page 218-219 |
| Geyer, Alan R. , Smith II, Robert C., Barnes, John H. (1976), Mineral Collecting in Pennsylvania, Page 218-219 |
| Econ Geol (1985) 80:418-443 |
| Geyer, Smith, Barnes, (1976) Mineral collecting in Pennsylvania pg 226-228 |
| Gems and Minerals of America- Jay Ellis Ransom-1974 |
York County, Pennsylvania, USA