|From: Las parabras del silencio|
Dr. Tucker — botanist, emeritus professor, and co-director of the Claude E. Phillips Herbariumat Delaware State University — and Mr. Talbert, a retired information technologist formerly employed by the US Department of Defense and NASA, decided to look first at the botanical illustrations in the Voynich Manuscript and compare them to the world's geographic plant distribution at the time of the manuscript's first recorded appearance (ca. 1576-1612).
The similarities between a plant illustrated in the Voynich Manuscript and the soap plant depicted in the 1552 Codex Cruz-Badianus of Mexico — considered the first medical text written in the New World — propelled the authors down a path leading to the identification of 37 plants, 6 animals, and 1 mineral in the manuscript from the Americas — specifically, from post-Conquest Nueva España (New Spain) and the surrounding regions.”
— Digital Journal