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Nordmann, Charles. Essai sur le role 

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The sun-spot period and the 



Tariations of the mean annual temperature 

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Norrenberg, J. Zum astronoraischen 



Unterricht an hoheren Schulen. Natur u. 



Schule, Leipzig, 4, 1904, (17-21). [0050]. 



7970 



Der astronomische Unten-icht 



in den Klosterschulen. "SVeltall, Berlin, 

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Nusl, F. Stereoskop a stereokom- 



parator. [Stereoskop und Stereokom- 



parator.] Ziva, Prag, 14,'l904, (99-106). 



[2140]. 7972 



und Fric, Josef Jan. ]\Iit- 



teilung liber das Diazenital . Astr . Nachr . , 

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7973 



Nyren, M[agnus]. Otto AVilhelm 



Struve. [Xekrolog.] Astr. Nachr., Kiel, 



168, 1905, (77-80). [0010]. 7974 



Ocoulitsch, L. r. Kaminsky, M. 



Oefele, Felix von. Die Angahen der 

 Berliner Planetentafel P 8279 verglichen 

 mit der Geburtsgeschichte Christi im 

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 7975 



Das Horoskop der Emp- 



fangnis Christi mit den Evangelien 

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O'Halloran, Eose. Variable stars. 

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Notes on variable stars. 



O'Halloran, Piose. Variable stars. San 

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Variable star notes. San 



San Francisco, Cal., Pub. Astr. Soc. Pac, 

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The great sunspot of October, 



1903. San Francisco, Cal., Pub. Astr. 

 Soc. Pac, 15, 1903, (237-239, M-ith text 

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A few details of the twelve- 



vear sun-spot cycle. San Francisco, Cal., 

 Pub. Astr. Soc Pac, 16, 1904, (93-96, 

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Francisco, Cal., Pub. Astr. Soc. Pac, 16, 



1904, (207-210, with text fig.). [7600]. 



7982 



Maxima of two variables. 



Pop. Astr., Northfield, Minn., 11, 1903, 

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W Lyrae, V Hydrae, S Ursae 



Minoris, T Ursae Majoris. Pop. Astr., 

 Northfield, Minn., 11, 1903, (216-218). 

 [7600]. 7984 



Stars that periodically glow 



and fade. Pop. Astr., Northfield, Minn., 

 11, 1903, (294-297, with text fig.). 

 [7600]. 7985 



Observations of variable 



stars. Pop. Astr., Northfield, Minn., 11, 

 1903, (399-401). [7600]. 7986 



The great sunspot. Pop. 



Astr., Northfield, Minn., 11, 1903, (579- 

 580, with text fig.). [4070]. 7987 



Some details of the recent 



solar cycle. Pop. Astr. , Northfield, Minn. , 



12, 1904, (27-32, with text fig.). [4070]. 



7988 



Variable star notes. Pop. 



Astr., Northfield, Minn., 12, 1904, (496- 

 497, with text fig.). [7600]. 7989 



Olivier, Charles P. Meteors observed 

 at LeanderMcCormick Observatory'. Pop. 

 Astr., Northfield, Minn., 11, 1903, (512- 

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Leonids at Leander McCor- 



mick Observatorv. Pop. Astr., North- 

 field, Minn., 11, "1903, (581). [6650]. 



7991 



Orionids at university of 



V[irgini]a. Pop. Astr., Northfield, Minn., 

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Oom, Bastos et Campos-Rodrigues. 



Observations meridiennes de la planete 

 Eros, faites a I'observatoire royal de 

 Lisbonne (Tapada). Bulletin du Comite 

 international permanent de la Carte photo- 

 graphique du Ciel, 3, 1903-1904, (516). 

 [Circulaii-e d'Eros, No. 9.] [5910]. 7993 



Oppenheim, S[amuel]. Die Temperatur 



der Sonne. "Wieu, MonBl. Wiss. Club, 



26, (1904-1905), 1905, (62-66). [4200]. 



7994 



Ueber das Verhaltnis des 



Koppernikanischen "Weltsystems zu dera 

 Ptolomiiischen. Zs. ptysik. L'nterr., 

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