The first five books were published by Popular Library. They were reprinted in 1982 by Warner Books and several times throughout the 1980s, who also published the other books in the series at the same time as the Popular Library editions, which were identical.
The first five books were published by Popular Library. They were also reprinted by Warner Books and released several times throughout the 1980s along with the other books in the series, which had identical editions as the original Popular Library publications.