According to the insert. this album was the first in "The Space Truckin' Trilogy": Part 1: [a6415] <Moonrock> NASA7CD/LP Part 2: [a82758] <When Worlds Collide> NASA10CD/LP Part 3: [a86193] <The Fly That Bugged Me> NASA12CD/LP However, it seems that parts 2 and 3 never saw the light of day, at least not in this form.