Space Primer (AU-18): Comprehensive Spaceflight History and Guidebook, Doctrine, Orbital Mechanics, Military Space, Satellites, Rockets, NASA Programs, Threats, Designs, Operations, Intelligence    by Progressive Management
Price: $9.99 USD. 132550 words. Published on April 12, 2011. .
In what may be the best single-volume introduction to military and civilian space flight, this up-to-date space primer from the Department of Defense provides comprehensive coverage of modern spaceflight principles and practices, with an extensive and authoritative history of military and NASA programs, along with the fundamentals of space.

Semper Audacia    by M. Pax
Price: $0.99 USD. 19880 words. Published on September 27, 2011. .
Space opera. Novelette. 13,200 words. Alone. Leda is the last living member of the brigade, the sole defender of her world. War took everyone she knew, leaving her in the company of memories and ghosts. Or is it madness? The siren blares. In an aging flyer, Leda ventures out to meet her world's fate, the last stand.

The Nameless War - Nameless War Trilogy Book One    by Edmond Barrett
You set the price! 120500 words. Published on March 10, 2013. .
First came contact, then genocide, now war. The Nameless have superior technology, numbers and a willingness to accept casualties that goes beyond comprehension. Their aim, nothing less than the total destruction of humanity. All that stands in their way, five officers, a handful of ships… and the human need to survive!