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An address intended to promote a geological and mineralogical survey of Pennsylvania, the publication of a series of geological maps and the formation of state and county geological and mineralogical collections
- "An address intended to promote a geological and mineralogical survey of Pennsylvania, the publication of a series of geological maps and the formation of state and county geological and mineralogical collections"
- "An address intended to promote a geological and mineralogical survey of Pennsylvania, the publication of a series of geological maps, and the formation of state and county geological and mineralogical collections"