The Night Face and Other Stories

the long version

SECOND ACE EDITION. Feb. 1978 MASS MARKET PAPERBACK, Poul Anderson (The High Crusade). The men on the spaceship Quetzal had a mission to perform, but everything indicated it would be a simple matter to set up a refueling station on the planet Gwydion. Advance explorations had already determined that the inhabitants of Gwydion were few in number and thouroughly amiable in their ways. In fact, such concepts as anger, thievery, murder and warfare did not exist for them. All that remained for the Quetzal was to find a suitable site and cement friendly relations. - Goodreads