318, [1] pp. Blue cloth, red titles. Frontispiece and plates by John Coleman Burroughs. A sequel to the celebrated Pellucidar novels, notable because Grosset & Dunlap did not immediately release their own printing of the work (though they did sell 2400 copies of the ERB first edition with G&D jackets). In 2015 a Grosset & Dunlap edition was arranged to be printed in a limited edition of 300 copies from the original ERB plates (Lukes p.355-6). 'Lieutenant Wilhelm von Horst finds love and adventure in the prehistoric world of the eternal sun.'
