Murray Leinster 
First Contacts: The Essential Murray Leinster [EPUB ebook] 

A collection of the trend-setting stories from "the Dean of Science Fiction" which opened and explored such topics as first contact with aliens, the Internet, transfers among parallel universes, and many more. "The best of [these stories] are remarkable inventions, providing a window on to science fiction’s first Golden Age that demonstrates exactly what made it golden" – Kirkus Review