Google Books Ngram Viewer

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

1800 - 1899 1900 - 1989 1990 - 1993 1994 - 1997 1998 - 2000 cocaine English
1800 - 1952 1953 - 1973 1974 - 1976 1977 - 1997 1998 - 2000 heroin English
1800 - 1962 1963 - 1975 1976 - 1977 1978 - 1992 1993 - 2000 amphetamine English
1800 - 1964 1965 - 1973 1974 - 1975 1976 - 1991 1992 - 2000 lsd English
1800 - 1969 1970 1971 - 1980 1981 - 1996 1997 - 2000 marijuana English

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