That obsolote terminology may have been in effect back in the late 60's (my 1969 handbook also used it). However, the 1993 edition (the oldest one I have)of the IEEE Red Book discusses ANSI C84.1-1989 as the standard that defines the nominal voltages in the US.
Usage of obsolete voltages (i.e. 110 and 220) is discouraged when refering to supply systems.
