by CL Eldridge 1977 Cited by 3 — coal pr oduc t ion in Iowa was consumed by t he railroad industry. these are: l) the discover y of vast deposits of coal in the west; 2) the The model used both continuous variables, for the mining, trans- of clean coal shipped from beneficiation plant site j to user k. H = total working hours per year of vehicle-type v .read more
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