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- 13013020 contributor B505869.
- 13013020 created "1912.".
- 13013020 date "1912".
- 13013020 date "1912.".
- 13013020 dateCopyrighted "1912.".
- 13013020 extent "2 p.l., 44 p.".
- 13013020 isPartOf "Contributions from the Princeton University Observatory. no. 2".
- 13013020 issued "1912".
- 13013020 issued "1912.".
- 13013020 language "eng".
- 13013020 publisher "Princeton, N.J., The Observatory,".
- 13013020 subject "QB837 .D85".
- 13013020 subject "Variable stars.".
- 13013020 title "Photometric researches, the Algol-system Z Draconis, by Raymond Smith Dugan.".
- 13013020 type "text".