Annals of the International Geophysical Year Volume XXII: Solar Activity Maps D2
Pergamon Press: Oxford, 1961. Folding cloth case containing file folders of plates showing solar activity for the months July 1957 through December 1958; with errata slip and guide; EX-LIBRARY from McMath-Hulbert Observatory with inkstamps on reverse of plates, folding cloth case very worn and stained. More