1949-80 OMITTED PREFIXES

FU  (Issued 1963, not listed 1964, only FU 946 listed 1965,

     discontinued 1966-80)

IO  (1965-80)

NH  (Issued 1972, only NH 337 listed 1973, discontinued 1975-80)

OO  (1971-80)

PP  (1971-80)