Google Books Ngram Viewer

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

1920 - 1924 1925 - 1927 1928 1929 - 1957 1958 african american English
1920 - 1923 1924 - 1947 1948 - 1949 1950 - 1951 1952 - 1958 italian american English

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