X-Factor Lot of 17 Issues from 69 to 91 Peter David

Issues 69, 70, 71, 74, 75, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91

Dates originally published were 

X-Factor 69 Cover Date August 1991

X-Factor 91 Cover Date April 1993