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2by Buhmann, Ronald W.Subjects: “...Astronomical observatories Directories....”
Published 1974
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3Published 1921Subjects: “...Earthquakes Observatories....”
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4Published 1931Subjects: “...Earthquakes Observatories....”
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5
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6
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7Published 1992Subjects: “...Geomagnetic observatories....”
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8by Svendsen, Kendall L. (Kendall Lorraine), 1919-Subjects: “...Geomagnetic observatories....”
Published 1992
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9Published 1983Subjects: “...Geophysical observatories United States....”
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10
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11by Donnelly, Marian C. (Marian Card)Subjects: “...Astronomical observatories History....”
Published 1973
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12by Kuiper, Gerard P. (Gerard Peter), 1905-1973Subjects: “...Astronomical observatories....”
Published 1960
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14Published 1978Subjects: “...Orbiting astronomical observatories....”
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15Published 1984Subjects: “...Observatories....”
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16Published 1984Subjects: “...Astronomical observatories....”
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17by Urbach, A. R.Subjects: “...Astronomical observatories....”
Published 1984
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18by Walker, A. B. C.Subjects: “...Orbiting solar observatories....”
Published 1986
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19Published 1986Subjects: “...Seismology Jordan Observatories....”
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20by Lukac, Marie R.Subjects: “...Astronomical observatories Directories....”
Published 2000
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