Extrapolation
74 issues
| May 1960 | Extrapolation, May 1960 |
| December 1960 | Extrapolation, December 1960 |
| May 1961 | Extrapolation, May 1961 |
| December 1962 | Extrapolation, December 1962 |
| May 1963 | Extrapolation, May 1963 |
| December 1963 | Extrapolation, December 1963 |
| May 1964 | Extrapolation, May 1964 |
| May 1965 | Extrapolation, May 1965 |
| December 1965 | Extrapolation, December 1965 |
| May 1966 | Extrapolation, May 1966 |
| May 1967 | Extrapolation, May 1967 |
| May 1968 | Extrapolation, May 1968 |
| May 1969 | Extrapolation, May 1969 |
| December 1969 | Extrapolation, December 1969 |
| May 1970 | Extrapolation, May 1970 |
| December 1970 | Extrapolation, December 1970 |
| May 1971 | Extrapolation, May 1971 |
| December 1971 | Extrapolation, December 1971 |
| May 1972 | Extrapolation, May 1972 |
| December 1972 | Extrapolation, December 1972 |
| May 1973 | Extrapolation, May 1973 |
| December 1973 | Extrapolation, December 1973 |
| May 1974 | Extrapolation, May 1974 |
| December 1974 | Extrapolation, December 1974 |
| May 1975 | Extrapolation, May 1975 |
| December 1975 | Extrapolation, December 1975 |
| May 1976 | Extrapolation, May 1976 |
| December 1976 | Extrapolation, December 1976 |
| May 1977 | Extrapolation, May 1977 |
| December 1977 | Extrapolation, December 1977 |
| May 1978 | Extrapolation, May 1978 |
| 1979 | Extrapolation, Fall 1979 |
| 1979 | Extrapolation, Spring 1979 |
| 1979 | Extrapolation, Summer 1979 |
| 1979 | Extrapolation, Winter 1979 |
| 1980 | Extrapolation, Fall 1980 |
| 1980 | Extrapolation, Spring 1980 |
| 1980 | Extrapolation, Summer 1980 |
| 1980 | Extrapolation, Winter 1980 |
| 1981 | Extrapolation, Fall 1981 |
| 1981 | Extrapolation, Spring 1981 |
| 1981 | Extrapolation, Winter 1981 |
| June 1981 | Extrapolation, Summer 1981 |
| 1982 | Extrapolation, Fall 1982 |
| 1982 | Extrapolation, Spring 1982 |
| 1982 | Extrapolation, Summer 1982 |
| 1982 | Extrapolation, Winter 1982 |
| 1983 | Extrapolation, Fall 1983 |
| 1983 | Extrapolation, Spring 1983 |
| 1983 | Extrapolation, Summer 1983 |
| 1983 | Extrapolation, Winter 1983 |
| 1984 | Extrapolation, Fall 1984 |
| 1984 | Extrapolation, Spring 1984 |
| 1984 | Extrapolation, Summer 1984 |
| 1984 | Extrapolation, Winter 1984 |
| 1985 | Extrapolation, Fall 1985 |
| 1985 | Extrapolation, Spring 1985 |
| 1985 | Extrapolation, Summer 1985 |
| 1985 | Extrapolation, Winter 1985 |
| 1986 | Extrapolation, Fall 1986 |
| 1986 | Extrapolation, Spring 1986 |
| 1986 | Extrapolation, Summer 1986 |
| 1986 | Extrapolation, Winter 1986 |
| 1987 | Extrapolation, Fall 1987 |
| 1987 | Extrapolation, Spring 1987 |
| 1987 | Extrapolation, Summer 1987 |
| 1987 | Extrapolation, Winter 1987 |
| 1987 | Extrapolation, Winter 1987 |