Google Books Ngram Viewer

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

1800 - 1888 1889 - 1972 1973 - 1980 1981 - 1990 1991 - 2000 shallow depth English
1800 - 1882 1883 - 1971 1972 - 1978 1979 - 1987 1988 - 2000 shallow depths English
1800 - 1892 1893 - 1943 1944 - 1950 1951 - 1989 1990 - 2000 low altitude English

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