NMLP P-007277 · True-first precedence · minted 2026-07-04

From the Mixed-Up Files of Mrs. Basil E. Frankweiler

E. L. Konigsburg · Atheneum · 1967

US true first, Atheneum 1967. Won the 1968 Newbery Medal, so the seal is a later jacket point.

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New Mexico Literacy Project — True-first precedence NMLP P-007277 for "From the Mixed-Up Files of Mrs. Basil E. Frankweiler" by E. L. Konigsburg (https://newmexicoliteracyproject.org/id/point/p-007277, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).