Google Books Ngram Viewer

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

1900 - 1930 1931 - 1955 1956 - 1959 1960 - 1978 1979 - 2000 roentgenogram English

Run your own experiment! Raw data is available for download here.
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