Tarzana, California: Edgar Rice Burroughs, Inc. Publishers, [1937]. Octavo, pp. [1-4] 5-318 [319: ads] [320: blank], seven inserted plates with illustrations by John Coleman Burroughs, original pebbled blue cloth, front and spine panels stamped in orange, top edge stained red, fore-edge untrimmed, bottom edge rough trimmed. First edition. The fifth Pellucidar novel. Angenot and Khouri, "An International Bibliography of Prehistoric Fiction," SFS, VIII (March 1981), 42. Bleiler (1978), p. 35. Reginald 02271. Heins BSA-1.

New York: Grosset and Dunlap, [1926]. Octavo, cloth. Reprint. Heins BHB-2.

New York: Ace Books, Inc., [1964]. Small octavo, cover by Frank Frazetta, pictorial wrappers. First paperback edition. Ace F-282. Contains "Beyond the Farthest Star" and "Tangor Returns", both first published in book form in TALES OF THREE PLANETS.

South Ozone Park, New York: Science-Fiction & Fantasy Publications, 1957. Octavo, dust jacket illustration by Gil Kane, cloth. First combined (and first hardcover) edition. Collects "Beyond Thirty" (1916) and "The Man-Eater" (1915). Heins BTh-1.

Chicago: A. C. McClurg & Co., 1925. Octavo, pp. [1-8] 1-323 [324: blank], frontispiece by J. Allen St. John, original blue cloth, front and spine panels stamped in black. First edition. First binding with "A. C. McCLURG / & CO" at base of spine panel. 5000 copies printed. Angenot and Khouri, "An International Bibliography of Prehistoric Fiction," SFS, VIII (March 1981), 42. Barron (ed), Fantasy Literature 3-59. Bleiler, Science-Fiction: The Early Years 333. Clareson, Science Fiction in America, 1870s-1930s 106. Bleiler (1978), p. 35. Reginald 02277. Heins CaG-1.

Kansas City, Missouri: House of Greystoke, 1965. cover art by Frank Frazetta, original mustard pictorial wrappers. First edition. First published as a 4-part serial in ARGOSY ALL-STORY WEEKLY, 8 October 1921 through 29 October 1921. The text here is reproduced from the ARGOSY magazine text. Zeuschner 116.

New York: Metropolitan Books, Inc. Publishers, [1931]. Octavo, pp. [1-6] 7-319 [320: blank], inserted frontispiece with illustration by Hugh Hutton, original red mesh weave cloth, front and spine panels stamped in yellow-green, top edge stained green. First edition, first binding with "METROPOLITAN" at base of spine panel. Seventh book of the Mars series. Bleiler, Science-Fiction: The Early Years 310. Bleiler (1978), p. 35. Reginald 02281. Heins FMM-1.

Chicago: A. C. McClurg & Co., 1918. Octavo, pp. [i-vi] vii-xi [xii] 1-348, frontispiece by Frank E. Schoonover, original red cloth, front panel stamped in black and blind, spine panel stamped in black. First edition. Total of 10,000 copies printed. There were multiple printings, at least two, last dated 1919. Second book of the Mars series. Anatomy of Wonder (1976) 2-27. Bleiler, Science-Fiction: The Early Years 305. Clareson, Science Fiction in America, 1870s-1930s 108. In 333. Bleiler (1978), p. 35. Reginald 02282. Heins GM-1.

New York: Grosset & Dunlap Publishers, [1929]. Octavo, pp. [1-4] 5-79 [80: ads], original pictorial boards with green cloth shelf back. First edition, first printing. Illustrated by Hal Foster from his daily comic strip. Heins TA-11.

Tarzana, California: Edgar Rice Burroughs, Inc. Publishers, [1932]. Octavo. pp. [1-4] 5 [6] 7 [8] 9-318 [319: ads] [320: blank], six inserted plates with illustrations by Studley O. Burroughs, original blue cloth, front and spine panels stamped in orange, top edge stained orange. First edition. An American explorer discovers an ancient civilization in the interior jungles of Cambodia. The second and scarcest book published by Burroughs's publishing company. Clareson, Science Fiction in America, 1870s-1930s 109. Bleiler (1978), p. 35. Heins JG-1.

Chicago: A. C. McClurg & Co., 1919. Octavo, pp. [1-8] 1-319 [320: blank], five inserted plates with illustrations by J. Allen St. John and twelve full-page St. John illustrations in the text, original orange cloth, front and spine panels stamped in black. First edition, first printing, first binding with publisher's imprint on spine panel set on three lines. Total of 63,000 copies printed. There were multiple printings, probably four, all dated 1919. Bleiler, Science-Fiction: The Early Years 319. Bleiler (1978), p. 35. Reginald 02286. Heins JT-1.

New York: Ace Books, Inc., [1963-. Small octavo, covers by Roy Krenkel, pictorial wrappers. First paperback editions. Ace F-213, F-220, F-233. The text of these editions follows that of the original versions in Blue Book Magazine August 1918 (1), October 1918 (2) and December 1918 (3). Published in hardcover as THE LAND THAT TIME FORGOT.