NMLP P-038994 · Point of issue · minted 2026-07-19

The Secret of the Old Clock (Nancy Drew #1)

Carolyn Keene (Mildred Wirt Benson) · Grosset & Dunlap (New York) · 1930

The copyright/series page lists only the first three titles — The Secret of the Old Clock, The Hidden Staircase and The Bungalow Mystery — followed by "Other Volumes In Preparation." The post-text advertising section opens "This Isn't All!" and carries ad lists for Hardy Boys (8 titles), Ted Scott

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New Mexico Literacy Project — Point of issue NMLP P-038994 for "The Secret of the Old Clock (Nancy Drew #1)" by Carolyn Keene (Mildred Wirt Benson) (https://newmexicoliteracyproject.org/id/point/p-038994, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).