The Medstar Duology

Medstar by Michael Reaves & Steve Perry
Inspired by the real-world sitcom M*A*S*H, this is a lovable pair of books about the varied characters who come together to work at a Republic battlefield hospital during the Clone Wars.

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Medstar I: Battle Surgeons
Medstar II: Jedi Healer

This is a prequel era series from the Legends timeline. It may be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe). 

Death Star

Death Star by Michael Reaves & Steve Perry
A novel about the construction of the first Death Star, and the many different people whose lives it touched.

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This is a classic era book from the Legends timeline. It will likely be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe).

Shadows of the Empire

Shadows of the Empire by Steve Perry
The only novel set between The Empire Strikes Back and Return of the Jedi, this book was published in 1996 as a refreshing return to the classic trilogy era, in the years where most novels took place after the defeat of the Emperor. The book is essentially a lead-in to Return of the Jedi, setting up the background for many of the events in that movie. However, it revolves heavily around a new character, the crime kingpin Prince Xizor, who is competing with Vader for the Emperor's favor.

Though the book tells a reasonably engaging story, many readers remember it more for its creepy attempted rape scene (for the record, most Star Wars novels have no sexual content at all).

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This is a classic era book from the Legends timeline. It will likely be contradicted by newer books (if so, just think of it as an alternate universe).