The Shakespearean ciphers examined :

an analysis of cryptographic systems used as evidence that some author other than William Shakespeare wrote the plays commonly attributed to him /
by William F. Friedman & Elizabeth S. Friedman.
Bibliographic Details
Main Creator: Friedman, William F. (William Frederick), 1891-1969.
Contributors: Friedman, Elizebeth, 1892-1980.
Format: Book
Language:English
Published / Created: Cambridge [Eng.] : University Press, 1957.
Subjects:
Notes:Physical description: vii-xvi p., 1 leaf 1-302 p. 1 leaf, plates : ill ; 22 cm. (8vo)