NMLP P-026511 · True-first precedence · minted 2026-07-04

The Son of Neptune (Heroes of Olympus 2)

Rick Riordan · Disney-Hyperion (New York) · 2011

US first edition (Disney-Hyperion, October 4, 2011), the recognized first for this American author; the US trade edition is the standard collector reference over the near-simultaneous UK Puffin release, and separate from the signed 1,000-copy numbered limited edition.

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New Mexico Literacy Project — True-first precedence NMLP P-026511 for "The Son of Neptune (Heroes of Olympus 2)" by Rick Riordan (https://newmexicoliteracyproject.org/id/point/p-026511, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).