Masters of Space by E. E. 'Doc' Smith, Science Fiction, Adventure, Space Opera - Paperback

by E. E. 'Doc' Smith (Author), E. Everett Evans (Author)

The crew's strange encounter leaves them baffled and leads them to a view an epic space battle. But strange as that is, it's nowhere near as mysterious as finding a planet covered in radioactive fuel ore -- and populated with humanoid robots who have been expecting their arrival and greet them as returning masters. . .