Google Books Ngram Viewer

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

1800 - 1877 1878 - 1929 1930 - 1934 1935 - 1974 1975 - 2000 herd of elephant English
1800 - 1908 1909 - 1931 1932 - 1936 1937 - 1988 1989 - 2000 herds of elephant English
1800 - 1823 1824 - 1871 1872 - 1882 1883 - 1961 1962 - 2000 herds of elephants English

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