The Search for Zei by de Camp, L. Sprague

First edition. Light shelfwear to edges and boards. DJ not clipped and covered with mylar. Pages tight and clean. Library discard with usual attachments/marks. 224 pages. HardCover Binding. Year: 1962. ISBN: 0. By the middle of the Twenty-Second Century, men had become star-rovers, maintaining friendly relations with many alien races among the galaxies. And Earth Administration co-operated with other advanced races in keeping a friendly eye upon the cultures of ""backward"" planets. The agreed-upon code was that science and gadgets beyond the cultural level of the peoples inhabiting such a planet would not be introduced by Earthmen, or other visitors.