I purchased this copy in the dealers room at the World Science Fiction Convention. Among other sellers it has the largest concentration of science fiction book dealers you'll ever find in one place. Many sell classics and rare editions, including manuscripts, proofs, and advance reading copies. The convention is also the best place to meet your favourite authors. For example, I've met Sharon Lee and Steve Miller several times as well as Robert Silverberg who autographed the proof copy of Lord Valentine's Castle for me.