Grosset & Dunlap - Pellucidar Series
(LEFT) J. Allen St. John illustration for Pellucidar, first edition
1918 — The first of several sequels to
At the Earth's Core was
Pellucidar, serialized in All-Story beginning May 1, 1915, and not
having book publication until 1923 from A. C. McClurg. Besides
the dust wrapper, St John provided four sepia plates within.
   While not published as often as the Martian or Tarzan stories,
the Pellucidar series has remained popular even though no one
today believes that such a hollow-earth is even possible.  The
first book in the series,
At the Earth's Core, was begun in 1913.  
The last book in the series,
Savage Pellucidar, would be
published posthumously fifty years later in 1963.
At the Earth's Core - Version 2  G&D c. 1924  - $10.99
AT THE EARTH'S CORE - G&D - c.1932 -  $10.99
Tarzan at the Earth's Core - G&D c. 1937 - $11.99
Edgar Rice Burroughs circa 1925.
(RIGHT) Bradbury has made this hyperbolic statement (right
caption in picture) many times in many forums, but the most
succinct and explanatory version is this excerpt from Sam
Weller's recently published book,
Listen To The Echoes: The Ray
Bradbury Interviews,
Bradbury talks about Burroughs, creator of
Tarzan. . .

   "I love to say it because it upsets everyone terribly—
Burroughs is probably the most influential writer in the entire
history of the world," . . .

   "By giving romance and adventure to a whole generation of boys,
Burroughs caused them to go out and decide to become special.
That's what we have to do for everyone, give the gift of life with our
books. Say to a girl or boy at age ten: Hey, life is fun! Grow tall!
    I've talked to more biochemists and more astronomers and
technologists in various fields, who, when they were ten years old,
fell in love with John Carter and Tarzan and decided to become
something romantic. Burroughs put us on the moon. All the
technologists read Burroughs."
Tanar of Pellucidar  - G&D C. 1931 - $11.99
Pellucidar - G&D edition c. 1929 -  $10.99
PELLUCIDAR - G&D c. 1926  V2 -  $10.99
At the Earth's Core - antiqued G&D c.1924  - $10.99