0.23 Charles Tilly, Computers in Historical Analysis, Computers and the Humanities, 1973.
| { history social political american } | 0.23 | 
| { work question important problem } | 0.14 | 
| { time make years individual } | 0.14 | 
| { computer program programs programming } | 0.07 | 
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, Abstracts and Brief Notices, Computers and the Humanities, 1984.