I also read Lucifers Hammer by the same two, but it was so long ago, all I remember are the titles they were so unusual. I then got into reading all of Louis L’mour books and really got upset when he up and died. Most excellent stories of the old west and he was a great story teller.
Pournelle is a real modern Renaissance man, besides the fiction he was a computer columnist, and he covers much political subject matter on his blog, from a principled, informed, educated paleoconservative standpoint.