Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1946 1947 - 1987 1988 - 1992 1993 - 1996 1997 - 2000 sigmund freud English
1800 - 1958 1959 - 1972 1973 - 1974 1975 - 1995 1996 - 2000 wilhelm reich English
1800 - 1912 1913 - 1928 1929 - 1934 1935 - 1987 1988 - 2000 havelock ellis English
1800 - 1931 1932 - 1989 1990 - 1994 1995 - 1997 1998 - 2000 magnus hirschfeld English
1800 - 1960 1961 - 1991 1992 - 1994 1995 - 1997 1998 - 2000 alfred kinsey English

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