Blackmoor (Supplement II), softback supplement for Original D&D, 1st printing, by Dave Arneson
The second supplement for D&D. This supplement introduced Monks and Assassins, a hit location system (whatever happened to that?), rules for underwater adventures, diseases, and the Sahuagin. It also includes TSR’s first ever published adventure ‘The Temple of the Frog’.
This copy is a first printing, from December 1975. The condition is generally VERY GOOD, except that a label has been removed from the top right of the front cover at some point (not entirely successfully) and a previous owner has typed his name, town and postcode on the inside front cover.