The Black Widowers is a 6-book series with 6 primary works first released in 1974 with contributions by Isaac Asimov.
#1 of 6 in The Black Widowers
1974 • 3 Readers • 263 pages • 4
#2 of 6 in The Black Widowers
1976 • 5 Readers • 223 pages • 4
#4 of 6 in The Black Widowers
1984 • 5 Readers • 212 pages • 3
#5 of 6 in The Black Widowers
1990 • 1 Reader • 256 pages
#6 of 6 in The Black Widowers
1989 • 1 Reader • 335 pages