The most interesting thing about this publisher is that they produced the first modern mass-market paperback books.and were a great influence on Penguin Books. (Info from Wikipedia)
harpercollins imprint p/b, still using the 1977 panther/granada/grafton isbn and setting, and
cover art by heinrich hoerle
cover price £3.99, australia $9.95, new zealand $14.95, canada $6.50
208pp. including titles, indica etc, end pp. advertising (this comment is from another edition of this book)