학술논문
Instructions for observing the Total Solar Eclipse of July 29, 1878 :Issued by the U. S. Naval Observatory
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München, Bayerische Staatsbibliothek -- 4 Phys.sp. 226 m#Beibd.11
Munich, Bavarian State Library -- 4 Phys.sp. 226 m #Beibd.11
Munich, Bavarian State Library -- 4 Phys.sp. 226 m #Beibd.11