NMLP P-007473 · True-first precedence · minted 2026-07-04
The Mixed-Up Files of Mrs. Basil E. Frankweiler
E.L. Konigsburg · Atheneum · 1967
US Atheneum first. Newbery Medal 1968; the first-state jacket predates the seal. Full title on the book is 'From the Mixed-Up Files of Mrs. Basil E. Frankweiler.' Among Konigsburg's two debut titles, both published by Atheneum in 1967.
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New Mexico Literacy Project — True-first precedence NMLP P-007473 for "The Mixed-Up Files of Mrs. Basil E. Frankweiler" by E.L. Konigsburg (https://newmexicoliteracyproject.org/id/point/p-007473, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).