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pennsylvania links state college weather pennsylvania spatial data access usgs water resources of pennsylvania hydrogeology and geophysics links usgs software usgs branch of geophysics epa: search your community the hydrogeologist's home page ubc inversion facility tutorials csm's online geophysics course sage: the summer of applied geophysical experience other helpful stuff matlab central file exchange mathworld math resource isi web of knowledge (requires a subscription) unit conversion currency conversion bad translations tomorrow's professor listserv geoscience career and grad school resources north american geoscience departments find out-of-print and hard-to-find books