- Series: Heritage Trilogy Series Record # 11764
- Sub-series of: Marines In Space / Galactic Marines
- Webpages: Wikipedia-EN
- Heritage Trilogy
- 1 Semper Mars (1998) by William H. Keith, Jr. [only as by Ian Douglas]
- 2 Luna Marine (1999) by William H. Keith, Jr. [only as by Ian Douglas]
- 3 Europa Strike (2000) by William H. Keith, Jr. [only as by Ian Douglas]
- The Heritage Trilogy (2014) [O/1-3] by William H. Keith, Jr. [only as by Ian Douglas]