Letter Gothic 12 Pitch family (Bitstream library) contains 4 fonts.
Roger Roberson skillfully adapted the sanserif to the monospace IBM typewriter at Lexington, Kentucky, in 1956.
Letter Gothic 12 Pitch Std Roman
Letter Gothic 12 Pitch Std Italic
Letter Gothic 12 Pitch Std Bold
Letter Gothic 12 Pitch Std Bold Italic
Font collection on Fonts-online.com Alphabet font list