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      1723 — 1725 [1]
      1823 — 1825 [1]
      1936) [1]
      230th/u dating [2]
      2nd derivation of satellite gravity [1]
      37caesium [1]
      3814 [1]
      3815 [1]
      3916 [1]
      4323 [1]
      4427 [1]
      4725 [1]
      5409 [1]
      5410 [1]
      5914 [1]
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      6210 [1]
      6211 [1]