Order of Galactic Marines Books
The Galactic Marines saga is a series of military science fiction novels by Ian Douglas (William H. Keith). The series is made up of three trilogies – the Heritage trilogy, Legacy trilogy and Inheritance trilogy. The Heritage trilogy is set in the future, when humans begin to find out their true origins. The other two trilogies both follow the descendants of the Heritage trilogy.
Ian Douglas began his Galactic Marines series in 1998 with the novel Semper Mars. The final Galactic Marines novel was Semper Human, published in 2009. Below is a list of Ian Douglas’ Galactic Marines books in order of when they were originally published (which is the same as their chronological order):
Publication Order of Heritage Trilogy Books
| Semper Mars | (1998) |    |
| Luna Marine | (1999) | |
| Europa Strike | (2000) | |
Publication Order of The Legacy Trilogy Books
| Star Corps | (2003) | |
| Battlespace | (2006) | |
| Star Marines | (2007) | |
Publication Order of Inheritance Trilogy Books
| Star Strike | (2008) | |
| Galactic Corps | (2008) | |
| Semper Human | (2009) | |
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