| http://www.w3.org/ns/prov#value | - Western Pennsylvania???s vast bituminous coal fields were the reason that Pittsburgh and other Midwestern cities became industrial magnets during the mid-1800s, but they were also responsible for these cities??? reputations for smoky air compared to cities such as Philadelphia and New York, where anthracite coal was used predominantly.4Richards???s Appeal (1868), discussed in the previous chapter,
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