E. E. 'Doc' Smith · Fantasy Press (Reading, Pennsylvania) · 1948
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New Mexico Literacy Project — Point of issue NMLP P-042207 for "Triplanetary" by E. E. 'Doc' Smith (https://newmexicoliteracyproject.org/id/point/p-042207, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).