Google Books Ngram Viewer

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

1800 - 1915 1916 - 1971 1972 - 1978 1979 - 1994 1995 - 2000 solidarity English
1800 - 1922 1923 - 1962 1963 - 1967 1968 - 1991 1992 - 2000 communism English
1800 - 1911 1912 - 1975 1976 - 1981 1982 - 1989 1990 - 2000 socialism English
1800 - 1924 1925 - 1976 1977 - 1982 1983 - 1989 1990 - 2000 trade union English

Run your own experiment! Raw data is available for download here.
© 2013 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer