The X-Files is a 8-book series with 8 primary works first released in 1994 with contributions by Charles L. Grant, Kevin J. Anderson, Ben Mezrich, Elizabeth Hand, Chris Carter, and Max Allan Collins.
1994 • 10 Readers • 288 pages • 3.3
1994 • 6 Readers • 288 pages • 1.8
1995 • 10 Readers • 304 pages • 2.7
1995 • 10 Readers • 264 pages • 3.5
1997 • 5 Readers • 256 pages • 3
1998 • 7 Readers • 272 pages • 3
1998 • 5 Readers • 192 pages • 3.5
2008 • 4 Readers • 256 pages • 2.8