I send a lot of books to soldiers overseas.  Many of the ask for science fiction books.  I work on collecting series, but often times I don't have a complete series ready to send.  I would like suggestions of stand alone sci fi books I could order to send when I don't have a series.  If you know some good sci fi books, please share the titles with me.  Especially if they are available on PBS.

R. M. Meluch has a number that were not in a series before the Merrimack series.

Almost all of the Robert Heinlein books would meet your requirements. Plus he is a well respected author of sci-fi.

I just posted a book titled Europe in Autumn.  It is a great novel, not my usual genre.  My young friend tells me it is Cyper Punk.  Very great writing IMO.  

Requested and mailed.

Childhood's End by Arthur C Clarke. One of the best novels I have ever read.

Would any of them be able tu use sci-fi recorded in MP-3 format? My brother gave me a bunch of them, mostly in a sub-genre called military sci-fi. Some don't have a record on PBS, others have 0 copies, 0 requestors. I'm not sure about loading them on my Bookshelf.

My friend has written a sci/fi fantasy book. It's available for free on Kindle. Check it out!
https://www.amazon.com/Story-Tale-Eighth-Herald-Book-ebook/dp/B077BBGQ8G/ref=sr_1_1?ie=UTF8&qid=1518373016&sr=8-1&keywords=Alicia%20Marsland&pldnSite=1