William T. Skilling & Robert S. Richardson.
Astronomy.
R612206. Astronomy. By William T. Skilling & Robert S. Richardson. NM: completely rewritten. © 2Sep47; A17126. Hugh H. Skilling (C) & Bobert S. Richardson (A); 25Aug75; R612206.
Hugh H. Skilling|C||Bobert S. Richardson|A