Riverworld is a 6-book series with 6 primary works first released in 1971 with contributions by Philip José Farmer.
1971 • 1 Reader • 351 pages
1971 • 1 Reader • 244 pages
1971 • 1 Reader • 240 pages • 3
1971 • 1 Reader • 2
1971 • 1 Reader • 222 pages
1971 • 28 Readers • 260 pages • 3.4
1980 • 13 Readers • 496 pages • 3.8
1983 • 14 Readers • 368 pages • 3.3
2010 • 336 pages
1993 • 1 Reader • 326 pages • 3