E. E. Doc Smith 
The Skylark of Space Super Pack [EPUB ebook] 

The Skylark of Space has been identified as the first space opera novel ever written. It holds a place of extreme importance to the science fiction field. The series follows Dr. Richard Seaton, the inventor of humanity’s first faster than light drive. He must keep his invention out of the hands of those who would use it for their own selfish purposes. But there is far worse than the most dastardly of waiting for us among the stars. It will take all of Seaton’s courage and technological know-how to keep humans safe, and even that might not be enough. A breathtaking adventure! This omnibus edition contains three books and more than 250, 000 words. Included are:
The Skylark of Space
Skylark Three
Skylark of Valeron