Google Books Ngram Viewer

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

1800 - 1878 1879 - 1966 1967 - 1977 1978 - 1989 1990 - 2000 monogamy English
1800 - 1820 1821 - 1877 1878 - 1890 1891 - 1974 1975 - 2000 polygamy English
1800 - 1893 1894 - 1977 1978 - 1985 1986 - 1994 1995 - 2000 polygyny English
1800 - 1877 1878 - 1888 1889 - 1895 1896 - 1982 1983 - 2000 polyandry English
1800 - 1906 1907 - 1971 1972 - 1974 1975 - 1985 1986 - 2000 group marriage English

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