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Jockenhövel, Albrecht et al. (1997) "Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe" Abteilung für Ur- und Frühgeschichtliche Archäologie, Westfälische Wilhelms-Universität Münster; abstract published as: Jockenhövel, A. (1997) "Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe". In Crew, Peter and Crew, Susan (editors) (1997) Early Ironworking in Europe: Archaeology and Experiment: Abstracts of the International Conference at Plas Tan y Bwlch 19–25 Sept. 1997 (Plas Tan y Bwlch Occasional Papers No 3) Snowdonia National Park Study Centre, Gwynedd, Wales, pp. 56–58. OCLC470699473. Archived here by WebCite on 11 March 2012
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Jockenhövel, Albrecht et al. (1997) "Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe" Abteilung für Ur- und Frühgeschichtliche Archäologie, Westfälische Wilhelms-Universität Münster; abstract published as: Jockenhövel, A. (1997) "Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe". In Crew, Peter and Crew, Susan (editors) (1997) Early Ironworking in Europe: Archaeology and Experiment: Abstracts of the International Conference at Plas Tan y Bwlch 19–25 Sept. 1997 (Plas Tan y Bwlch Occasional Papers No 3) Snowdonia National Park Study Centre, Gwynedd, Wales, pp. 56–58. OCLC470699473. Archived here by WebCite on 11 March 2012
worldcat.org
Northrop, Stuart A. (1959) "Limonite" Minerals of New Mexico (revised edition) University of New Mexico Press, Albuquerque, New Mexico, pp. 329–333, OCLC2753195
Brown, G. Chester (1915) Mines and mineral resources of Shasta county, Siskiyou county, Trinity county California State Mining Bureau, California State Printing Office, Sacramento, California, pages 15–16, OCLC5458708
Jockenhövel, Albrecht et al. (1997) "Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe" Abteilung für Ur- und Frühgeschichtliche Archäologie, Westfälische Wilhelms-Universität Münster; abstract published as: Jockenhövel, A. (1997) "Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe". In Crew, Peter and Crew, Susan (editors) (1997) Early Ironworking in Europe: Archaeology and Experiment: Abstracts of the International Conference at Plas Tan y Bwlch 19–25 Sept. 1997 (Plas Tan y Bwlch Occasional Papers No 3) Snowdonia National Park Study Centre, Gwynedd, Wales, pp. 56–58. OCLC470699473. Archived here by WebCite on 11 March 2012