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The National Observatory
Science
, 1883
openaire
pubmed.ncbi.nlm.nih.gov
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(10.1126/science.ns-2.34.415)
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THE OBSERVATORIES OF THE UNITEDSTATES
Science
, 1881
openaire
pubmed.ncbi.nlm.nih.gov
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(10.1126/science.os-2.30.22-c)
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physics
astronomy
astrophysics
meteorology
geography
geology
greenwich
soil science
environmental science
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