I propose the Dumarest series is the archetypical Traveller inspiration. As much as I like Cherryh, Downbelow Station, 40,000 in Gehenna, et. al.
The Dumarest books started publication in the late 60's, well in advance of Miller's classic LBBs, and mention, among other things:
- High, medium, and low passage as means of interstellar transport, with low passage having the same percentange chance of death as in the Traveller rules.
- A low passage lottery.
- The "blade" as a weapon of choice of the protagonist.
- Air rafts and boats.
- Spacecraft jumps and journeys that take a couple of weeks.
- "Library data" as a specific computer providing information about cultures and planets exactly as laid out in Traveller.
Most important is the presentation of a universe teeming with so many planets and cultures that no one knows them all, and a culture of travelers moving between them looking for adventure, opportunity, or amusement.
The atmosphere of the traveller universe is pretty much lifted from these books, with the imperium/military emphasis added (I think) because pretty much all the other popular SF of the time (Asimov, Anderson, Chandler, etc.) had one.
Sadly, the 3-4 books of the series I have read so far are - in my opinion - really bad writing, with a lot of focus on silly logistical detail, little to no character development, a lot of "tell, don't show," and women who only homicidal harpies or helpless naifs. Both types instantly swoon and fall in love with the hero of course, just because.
I will bring a couple this weekend and hand them out to anyone with interest.