This looks new/unread, with some dust-speckling/spotting on top page block. There are 2 extra "ChUSFA" stamps on the first set of endpapers, Unclipped dustjacket has no tears or flaws, and is in a higher quality Demco DJ protector (with paper backing so nothing is taped to the actual dustjacket) which was taped to book. That DJ protector is in great shape, so I left it on.

Magazine version in Dynamic Science Stories February 1939.