BURROUGHS, EDGAR RICE. At the Earth's Core. Chicago: McClurg, 1922. 8vo, original gray-green cloth (top of spine professionally strengthened); color pictorial dust jacket reproducing a painting by J. Allen St. John on front (restored); brown half morocco slipcase. FIRST EDITION of the first Pellucidar novel. 9 inserted plates with illustrations by St. John. Heins AEc-1.