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Essays Concerning Iron and Steel: The First, Containing Observations on American Sand-iron: the Second, Observations, Founded on Experiments, on Common Iron-ore... on the Sort of Iron Proper to be Converted Into Good Steel, and the Method of Refining that Bar-steel by Fusion... With an Account of Mr. Reaumur's Method of Softening Cast-iron: and an Appendix Discovering a More Perfect Method of Charring Pit Coal