On the advanced search form you need to use the first form "ISFDB Title Search Form". Enter "COVERART" in the Term 1 box and change the dropdown item from "Title" to "Title Type". Then in Term 2 you might enter "1970" and change that dropdown from "Title" to "Year", and then submit query. On the following screen you can click an item, say "Cover: A Gift From Earth", then on the following page click the title proper, which will get you to here
http://www.isfdb.org/cgi-bin/pl.cgi?641, for example. Redo with "1971" in Term 2 when you've exhausted "1970". And so on.
It is time consuming, but thorough.
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