Include:

• The Gods of Mars. Frontis. by Frank E. Schoonover. (Jacket with top ¾" of spine strip missing affecting title, chips to corners & foot.) Heins M2.4. [c.1920].
• The Warlord of Mars. Frontis. by J. Allen St. John. (Jacket with 2x2" triangle missing from top left of front panel, large chip at spine head, smaller chips to foot and corners.) Heins M3.3. [c.1920].
• Thuvia, Maid of Mars. Plates by J. Allen St. John. (Jacket with small chips at spine ends & corners, tear into front panel.) Heinz M4.3. [c.1921].
• The Master Mind of Mars. Illus. by J. Allen St. John. No dust jacket. Heins M6.2. [1929]
• A Fighting Man of Mars. Frontis. by Hugh Hutton. (Jacket rubbed at folds, joints & extremities, some minor chipping). Heins M7.5 [c.1932].
• Swords of Mars. Frontis. by J. Allen St. John. (Jacket with chips at spine ends & corners; pp. 192-257 darkened.) Heinx M8.3a. [c.1940].
• Synthetic Men of Mars. Frontis. by John Coleman Burroughs. (Jacket with minor extremity rubbing & edge wear.) Heinx M9.2. [1948].

Together, 7 volumes. Last in boards, others cloth, all but one with dust jackets. First 5 published by Grosset & Dunlap, last 2 by Edgar Rice Burroughs Inc. Reprint editions.