[by] Dept. of the Treasury, Internal Revenue Service
Govt. Print. Off.
1968-]
Publication - Internal Revenue Service
no. 198(1-68), 198(1-69), 198(3-74), 198(4-78), 198(5-70), 198(7-63), 1304(4-88)
1961 , 1966 , 1967 , 1968 , 1972 , 1976 , 1985 , 1986 , 1987
Available at 5 libraries