http://www.indiana.edu/~tisj/readers/full-text/15-4%20cronin.pdf has been crawled 28 times going all the way back to March 12, 2005.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ
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Note

This calendar view maps the number of times http://www.indiana.edu/~tisj/readers/full-text/15-4%20cronin.pdf was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.