NMLP P-042200 · Point of issue · minted 2026-07-19
The World of Null-A
A. E. van Vogt · Simon & Schuster (New York) · 1948
First book edition: Simon & Schuster, New York, 1948, issued under the title "The World of Ā" — the title page carries the Ā symbol, not the spelled-out "Null-A", which is itself a first-issue tell (the "Null-A" spelling belongs to the later Ace paperbacks)
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New Mexico Literacy Project — Point of issue NMLP P-042200 for "The World of Null-A" by A. E. van Vogt (https://newmexicoliteracyproject.org/id/point/p-042200, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).