Text ( visual ) : unmediated Skylab : a guidebook / by Leland F. Belew and Ernst Stuhlinger. -- Washington, D.C. : NASA : [For sale by the Supt. of Docs., U.S. G.P.O.] , 1973. -- x, 245 p. : ill. ; 23 cm. -- (NASA EP ; 107). -- Bibliography: p. 236. -- (BA75019616) ; https://ci.nii.ac.jp/ncid/BA75019616 Author Heading(s): Belew, Leland F. ; Stuhlinger, Ernst. -- Classification(s): LCC : TL789.8.U6 ; DC : 629.44/5. -- Subject Heading(s): LCSH : Skylab Program