j. m. dent readers union science fiction book club h/cvr first printing
sold on a near-inertia sales model by subscription to book club members only
cover (d-j) art by terry james
cover (d-j) price (8/6)
160pp. including titles, indica, table-of-contents etc, end pp. bound with endpapers between covered boards
not allocated a 5000-series cat# in david & charles' 1973 renumbering after buying the readers union group of book clubs from dent, so no stock of this book remained by the end of 1972