What has the author William E Sizemore written?

You are likely thinking of William R. "Bill" Sizemore, who is a prolific science fiction author, although he has also written fantasy and horror. He's written over 50 books, many of them in series.

Here's some of his best-known work:

Series:

* The Adventures of the Galactic Patrol series: This is a long-running series set in a futuristic space-faring world.

* The Starship Troopers series: He wrote several novels in this popular series, which was inspired by the film of the same name.

* The Starfire series: This space opera series involves interstellar war and intrigue.

* The Last Legion series: This is a series of novels set in a world after an apocalypse.

Standalone novels:

* The Sword of the Stars: A fantasy novel set in a medieval-style world.

* The Shadow of the Stars: A science fiction novel about a lone astronaut struggling for survival.

This is just a small selection of the many books Bill Sizemore has written. You can find a more complete list on websites like Goodreads and Amazon.

Note: There are other authors with similar names, such as William E. Sizemore Jr. It's important to be specific about the author's full name when searching for their works.