NMLP P-017556 · True-first precedence · minted 2026-07-04

Mercy Watson: Princess in Disguise (Mercy Watson 4)

Kate DiCamillo · Candlewick Press (Cambridge, MA) · 2007

US Candlewick edition is the true first (2007). US author and US publisher, so no competing UK or Canadian precedence.

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New Mexico Literacy Project — True-first precedence NMLP P-017556 for "Mercy Watson: Princess in Disguise (Mercy Watson 4)" by Kate DiCamillo (https://newmexicoliteracyproject.org/id/point/p-017556, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).