The first link on Google has the following text:

Way only of trousers who ever work Jim invested. Witness different week moms of Elizabeth machining, Furniture ...

Probably not a reputable source of information. Goodreads cites the back cover copy:

The team from Earth had the task of raising backward planets to the home world's high level. The situation on Rigel was this: "The most advanced culture on Rigel's first planet is to be compared to the Italian cities during Europe's feudalistic yeas The most advanced of the second planet is comparable to the Aztecs at the time of the Spanish conquest" "These planets are in your control to the extent that no small group has ever dominated millions before. No Caesar ever exerted the power that will be in your collective hands. For half a century, you will be as gods and goddesses!"

So much for the prime directive, I guess.

The cover looks like first prize at the city-wide high school art contest.