Agatha Christie · William Collins, Sons (Crime Club), London · 1956
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New Mexico Literacy Project — Point of issue NMLP P-000284 for "Dead Man's Folly" by Agatha Christie (https://newmexicoliteracyproject.org/id/point/p-000284, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).