L. Ron Hubbard · The Hadley Publishing Co., Providence, Rhode Island · 1948
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New Mexico Literacy Project — Point of issue NMLP P-043687 for "Final Blackout" by L. Ron Hubbard (https://newmexicoliteracyproject.org/id/point/p-043687, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).