Based on the most recent edition of Clements' Birds of the World, the All Subspecies Add-On installs in BirdBase program all of the more than 21,000 subspecies names. BirdBase makes it easy for the user to edit the drop-down list in any way that it is needed to keep it in agreement with whatever changes Clements makes once the Add-On has been purchased.
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I don't know how you got a book printed 26 years ago in the conditions that I received it (like new) but you do it! ABSOLUTELY AWESOME!
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