MAPS DEPICTING THE DISTRIBUTION OF STATIONS
AT 10-YEAR INTERVALS
FROM 1828 TO 1888
1828 (Military Post Hospitals)
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1838 (Military Post Hospitals)
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1848 (Military Post Hospitals)
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1858 (Military Post Hospitals, US Patent Office w/ Smithsonian Inst.)
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1868 (Department of Agriculture Voluntary Observers)
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1878 (U.S.Army Signal Corps)
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1888 (U.S.Army Signal Corps)
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