Dungeons & Dragons Basic Rulebook, rare fourth UK printing
Softback rulebook (ONLY) from the Games Workshop UK edition (fourth printing) of the Eric Holmes edited D&D Basic Set, from November 1978. Most copies of this originally came in a box with five dice, a White Dwarf subscription form and a copy of adventure B1 In Search of the Unknown. The US edition of the rulebook was definitely available separately. I must admit I don’t know if this was the case for this printing of the UK edition.
Note that the final perforated page (a catalogue, with prices in £) has been removed from this copy.