Held on the occasion of the 1966 Vetlesen Prize award to Jan Hendrik Oort.
Bibliography
Includes bibliographies.
Contents
An appreciation of Jan Hendrik Oort, by B. Strömgren.--Radio astronomical studies of the galactic system, by J. H. Oort.--Spiral structures in galaxies by C.C. Lin.-- Some recent results of X-ray astronomy, by B. Rossi.--The time scale for creation, by A. Sandage.