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Message: <blockquote data-quote="Mysticete" data-source="post: 3587181" data-attributes="member: 67784">Ebird coverage is PROBABLY complete enough that you could probably get good numbers extending far back as maybe John Vanderpoel's attempt? Ideally you would need to output the data as a list of species, remove taxa that are not on the list, and use that.Older than that, you could probably go through back issues of North American Birds and go through the quarterly reports for rarities. It would be very laborious, and not something I for one would be eager to do. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>