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coal miningbanded coalcoalificationcoal processingcoal seamash contentgrindabilitycalorific valueproximate analysisrun-of-mine coalpetroleumnatural gasoil shalepeatasphaltbitumensiliceous rockphosphoriteevaporitebanded-iron formation
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E.F. Schumacher
British economist

Friedrich Flick
German industrialist

William Stanley Jevons
English economist and logician
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