books available in Ace editions
F-156 AT THE EARTH'S CORE
F-157 THE MOON MAID
F-158 PELLUCIDAR
F-159 THE MOON MEN
F-168 THUVIA, MAID OF MARS
F-169 TARZAN AND THE LOST EMPIRE
F-170 THE CHESSMEN OF MARS
F-171 TANAR OF PELLUCIDAR
F-179 PIRATES OF VENUS
F-180 TARZAN AT THE EARTH'S CORE
F-181 THE MASTERMIND OF MARS
F-182 THE MONSTER MEN
F-189 TARZAN THE INVINCIBLE
F-190 A FIGHTING MAN OF MARS
F-193 THE SON OF TARZAN
F-194 TARZAN TRIUMPHANT
F-203 THE BEASTS OF TARZAN
F-204 TARZAN AND THE JEWELS OF OPAR
F-205 TARZAN AND THE CITY OF GOLD
F-206 JUNGLE TALES OF TARZAN
F-212 TARZAN AND THE LION MAN
F-213 THE LAND THAT TIME FORGOT
F-220 THE PEOPLE THAT TIME FORGOT
F-221 LOST ON VENUS
F-232 THE LAND OF HIDDEN MEN
F-233 OUT OF TIME'S ABYSS
F-235 THE LOST CONTINENT