novelisations (?) published as adult fiction - the tv series was also aimed at adult audience in merkia:
a. novelizations (?) by murray leinster (usual and best-known by-line of william fitzgerald jenkins)
published by pyramid in mmpb:
(#1 & #2 reprinted in uk p/b under no imprint: distributed by world distributors (manchester) ltd.)
#1: "land of the giants" (1968) (this book, an expanded novelization)
aka ''the trap'' (uk 1969), q.v.
#2: "the hot spot" (1969), q.v.
#3: "unknown danger" (1969), q.v.
b. novelisations (?) by james bradwell (pseudonym of arthur william charles kent)
no order known/seen reported:
published under no publishers/imprint name in uk p/bs distributed by world distributors (manchester); ltd:
"the mean city" (1969), q.v.
"slingshot for a david" (1969), q.v.
c. published by whitman publishing as children's adventure fiction:
apparently authorised and licenced separately from the (two?) series of five mmpbs:
"flight of fear" carl henry rathjen (merkin h/cvr 1969), q.v.