Are the Lakota in SM Stirling's The Scourge Of God a bit like the Altaians in Poul Anderson's "A Message in Secret," civilized nomads who know about science and germ theory and who move books, printing presses and microscopes around in wagons? I am not about to reread Anderson's text to draw up a list of comparisons. I ought to have apprentices who can do that for me by now!
Anderson's Freeholders go further. Their post-civilization society involves living in a wilderness yet retaining and applying many aspects of familiar and newly discovered scientific knowledge. Their control of local organisms enables them to defeat the Terran Space Navy. (See here.)