Light shelfwear to edges and boards. DJ not clipped and covered with mylar. Library discard with usual attachments and marks. Pages tight and clean. First edition. 224 pages.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.Visit our eCRATER store forother greatNovels and save on shipping!Most books haveshelf wear and cover scuffing. Binding is tight. Actual covers may be different than stock photos. Pages may be yellowed due to books age. If condition is important, please ask for a more detailed description.INTERNATIONALSHIPPING: We ship worldwide for actual postage plus $1.75 handling. Buyer is encouraged to purchase insurance to guarantee safe delivery. International buyers must contact me for final costs before making payment.We only accept PayPal for International orders.Pay me securely with any major credit card through PayPal!