Big Planet

No book-club printing of the Avalon edition is documented in the sources consulted. Avalon sold into the library market, so ex-library copies with stamps, pockets, spine labels and taped jackets are the routine condition trap here rather than club copies. The issues to rule out are the Ace Double D-295 paperback (1958, backed with Slaves of the Klau), the Underwood-Miller 1978 limited (a "first thus" restoring the magazine text), and the later Gollancz issues. Any copy in wrappers, or in cloth without the Avalon Books imprint and 1957 date, is not the first.