Text ( visual ) : unmediated The milky way / Bart J. Bok and Priscilla F. Bok. -- 3d ed. -- Cambridge : Harvard University Press , 1957. -- vi, 269 p., 1 fold. leaf of plates : ill. ; 25 cm. -- (The Harvard books on astronomy). -- (BA24384691) ; https://ci.nii.ac.jp/ncid/BA24384691 Author Heading(s): Bok, Bart Jan ; Bok, Priscilla Fairfield. -- Classification(s): LCC : QB819 ; DC : 523.85. -- Subject Heading(s): LCSH : Milky Way