List of holders : Bentley's second phrase code : including all names registered up to 27th August, 1931 /
Bentley, E. L.,compiler.
Cover title.
"27th August, 1931"--Cover.
"Third list."
"This list contains the names only of such firms as have sent in registration cards or have definitely advised us that they are actual holders of the code."
Cipher and telegraph codes.