1977 A Heritage of Stars by Clifford D. Simak Vintage Science Fiction Hardcover

"Thousands of years into the future man has completely destroyed a technology-based society and lives a tribal existence, worshipping the 'brain'-cases of long-rusted robots. Here and there pockets of knowledge remain, and young Tom Cushing lives in one such university. His imagination fired by reading of the fabled 'Place of Going to the Stars' in an ancient manuscript, Tom sets out on a long odyssey to find out if the legend is true. His journey encompasses excitement, danger and some strange and colourful companions who commune with plants, can sense life and include the very last robot. But nothing he meets along the way compares with what he and his motley group find at Thunderhead Butte, the Place of Going to the Stars, their journey's end. Here wonder abounds almost as at the edge of the universe. A new challenge, for man to rediscover his destiny, to fulfil his heritage and recover his lost knowledge."