http://members.aol.com/_ht_a/renardym/news.html contains a response to the Kittredge article. (I believe this is a section of the same website noted in the letter to the editor cited above: however, there appears to be a typo in the URL in that letter.)

There’s also a website at:
http://www.geocities.com/audubon_transition/audubon_comment.html
that has some additional information and links.