NMLP P-042057 · True-first precedence · minted 2026-07-19

At the Earth's Core

Edgar Rice Burroughs · A. C. McClurg & Co., Chicago · 1922

US original, and the first book of the Pellucidar series — the McClurg Chicago 1922 edition is the true first in book form and precedes any English edition. The text first appeared as a four-part serial in All-Story Weekly, 4–25 April 1914. A Methuen (London) edition is reported to have followed in February 1923; that date rests on a single secondary source here and is NOT independently confirmed — cite the McClurg 1922 as the first and treat the Methuen year as unverified.

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New Mexico Literacy Project — True-first precedence NMLP P-042057 for "At the Earth's Core" by Edgar Rice Burroughs (https://newmexicoliteracyproject.org/id/point/p-042057, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).