Skilling, William T., - Our Revolving "Island Universe" and Its Spiralilng Counterparts - from The Smithsonian Report for 1945, Pages 125-136.

Washington, D.C., Smithsonian Institution, 1945. Trade Paperback., Vg- in Wraps. Stapled Booklet. Offprint Material. Pages: 12. Light Edgewear. A Few Uncut Page Edges.

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