NMLP P-027696 · True-first precedence · minted 2026-07-04
The Sigma Protocol
Robert Ludlum · St. Martin's Press · 2001
US St. Martin's Press first edition, October 2001. Published a few months after Ludlum's death in March 2001; it was the last novel released under his name during that period.
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New Mexico Literacy Project — True-first precedence NMLP P-027696 for "The Sigma Protocol" by Robert Ludlum (https://newmexicoliteracyproject.org/id/point/p-027696, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).