The UT System subscribes to Web of Science data back to 1965.
Sample Question: You want to find papers that have cited a paper written by Robert B. Woodward et al. that appeared in the Journal of the American Chemical Society, vol.73, 1951, pages 2403-04.
Scan the list carefully for typos and variant postings. You'll need to note the page numbers and volume number of the entry to verify it's the exact paper you're looking for. "Cited Work" titles are always abbreviated, sometimes not very consistently. Page numbers and volume numbers can be inaccurate or missing altogether. The number of Citing Articles is the total number of articles in the entire WOS database that cited that particular entry. In this example, the entry with page number "2043" is probably a typo, so that should be selected as well as the correct entry below it.
If the cited article is earlier than 1965, the number of records actually retrieved may be less than the number shown in the index listing. This is because the index counts citations in the entire Web of Knowledge database, whereas the retrievable ones are only those since 1965, UT's starting year of coverage. (In this example, only 27 of the 58 citing articles fell after 1965, and only these are retrievable.)