THE LEGION OF TIME - 1st Pyramid pr., 1967 - Very Good+    THE COMETEERS - Pyramid, 1st U.S. pb, 1967 - Very Good  THE PANDORA EFFECT - Ace, 1st pr., 1969 - VG+                                                                                                                Williamson was a pioneer of the science fiction magazines and had one of the longest careers in the field.   LEGION and COMETEERS are vintage book editions of two of his classic 1930s novels of time and space.  PANDORA  is the first printing of the first collection of his shorter work, the seven stories dating from 1928 to 1954.  LEGION & PANDORA have pretty light edge/corner wear (the latter also has a book owner label on the reverse of the front cover).   COMETEERS has a bit more wear, small bumps on the front page edges and small "6's stamped on the top page edges.  All three books are tightly bound with no writing.