An introduction to symbolic logic /
Langer, Susanne Katherina Knauth.
An introduction to symbolic logic / - 2d ed. (rev.) - New York: Dover Publications, 1953. - 367 p.
Logic, Symbolic and mathematical.
164 / LAN
An introduction to symbolic logic / - 2d ed. (rev.) - New York: Dover Publications, 1953. - 367 p.
Logic, Symbolic and mathematical.
164 / LAN