KING OF THE FOURTH PLANET by Robert Moore Williams      COSMIC CHECKMATE by Charles DeVet/Katherine MacLean  THE SILENT INVADERS by Robert Silverberg                          BATTLE ON VENUS by William F. Temple                                  THE WATER OF THOUGHT by Fred Saberhagen                      WE, THE VENUSIANS by John Rackham                                   Ace Books, First Book Publication, 1962/63/65                           Condition: Very Good Minus                                                                                                                                                              First two books (F-149 & F-195) have light cover/reading creases, modest edge/corner/spine end wear, some darkening on cover backs; KING has a store stamp inside.  M-127 has  a 1/2" spine split & a bit more spine wear, light creasing at one cover corner, 2 indentations on WATER cover which affects a few pages, some page-back darkening, a store stamp inside, o/w quiite nice.  All books have square spines, firm bindings and no writing.