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1
المؤلفون: Anne Kelly Knowles
المصدر: Technology and Culture. 46:847-849
مصطلحات موضوعية: History, Kingdom, business.industry, Coal, business, Engineering (miscellaneous), Archaeology
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2
المؤلفون: Robert B. Gordon, Anne Kelly Knowles
المصدر: Geographical Review. 92:606
مصطلحات موضوعية: Geography, Geography, Planning and Development, Archaeology, Earth-Surface Processes