http://chemeducator.org/sbibs/s0003006/spapers/36eag897.htm has been crawled 20 times going all the way back to June 14, 2003.

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://chemeducator.org/sbibs/s0003006/spapers/36eag897.htm was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.