By Year
1933 Radio Law (Keyes Annual) 1934 Communications Act 1937 (From Variety Radio Annual) 1938 (From Broadcasting Yearbook) 1940 (From Broadcasting Yearbook) 1942 (From Broadcasting Yearbook) 1946 (from Broadcasting Yearbook) 1950 (from Broadcasting Yearbook) 1956 (from Broadcasting Yearbook) 1957 (from Broadcasting Yearbook) 1960 (from Broadcasting Yearbook) 1965 (from Broadcasting Yearbook) 1970 (from Broadcasting Yearbook) 1975 (from Broadcasting Yearbook) 1980 (from Broadcasting Yearbook) 1985 (from Broadcasting Yearbook) 1991 (from Broadcasting Yearbook) 1992 (from Broadcasting Yearbook) 1993 (from Broadcasting Yearbook) 1994 (from Broadcasting Yearbook) 1995 (from Broadcasting Yearbook) 1997 (from Broadcasting Yearbook) 1980 (from Broadcasting Yearbook)
