A few facts regarding the geological survey of Pennsylvania : exposing the erroneous statements and claims of J.P. Lesley, secretary of the American Iron Assoc
"A few facts regarding the geological survey of Pennsylvania : exposing the erroneous statements and claims of J.P. Lesley, secretary of the American Iron Assoc"@en
"A few facts regarding the Geological Survey of Pennsylvania, : exposing the erroneous statements and claims of J.P. Lesley, secretary of the American Iron Association"@en
"A few facts regarding the Geological survey of Pennsylvania exposing the erroneous statements and claims of J.P. Lesley, secretary of the American iron association"@en
"A few facts regarding the geological survey of Pennsylvania exposing the erroneous statements and claims of J.P. Lesley, secretary of the American Iron Association"@en
"A few facts regarding the Geological survey of Pennsylvania exposing the erroneous statements and claims of J.P. Lesley, secretary of the American Iron Association"@en
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