Callahan's is a 11-book series with 11 primary works first released in 1977 with contributions by Spider Robinson and Barrett Whitener.
#1 of 9 in Callahan's
1977 • 42 Readers • 224 pages • 3.8
#2 of 9 in Callahan's
1981 • 12 Readers • 256 pages • 3.6
#5 of 9 in Callahan's
1992 • 3 Readers • 352 pages • 3
#2 of 2 in Mary's Place
1996 • 3 Readers • 214 pages • 3.3
#2 of 2 in The Place
2003 • 2 Readers • 286 pages • 4
9 Callahan's
1994 • 1 Reader • 5