The Noon Universe is a 9-book series with 9 primary works first released in 1961 with contributions by Arkady Strugatsky, Boris Strugatsky, and 4 others.
1961 • 10 Readers • 3.5
1964 • 53 Readers • 219 pages • 4.4
1979 • 6 Readers • 217 pages • 3.7
1984 • 2 Readers • 184 pages