"CHR 1921." . . "PRO Mendelsohn, Esther Jastrow (donor)" . . "Voynich manuscript." . . "PRO Mendelsohn, Charles J. (Charles Jastrow) (donor)" . . . . "Cryptology Collection (University of Pennsylvania)" . . . . . . . . . . . . . . . "The most mysterious manuscript in the world : did Roger Bacon write it and has the key been found?"@en . .