Star Trek: The Yesterday Saga is a 2-book series with 2 released primary works first released in 1983 with contributions by A.C. Crispin.
#11 of 189 in Star Trek: The Original Series
1983 • 3 Readers • 191 pages • 2
#39 of 189 in Star Trek: The Original Series
1986 • 7 Readers • 320 pages • 3