Comparative coal transportation costs: an economic and ...
@article{osti_6172050, title = {Comparative coal transportation costs: an economic and engineering analysis of truck, belt, rail, barge and coal slurry and pneumatic pipelines. Volume 8. Yellow ball rail. Final report. [Uses of salvage cars and old track as a gathering system for small mines]}, author = {Rieber, M. and Soo, S. L.}, abstractNote = {Rail cars are referred to as