Where can I see CBC circles on a map?

These KMZ files of currently active Christmas Bird Count circles can be displayed using Google Earth. These files were created July 2011 and are organized as follows:

File #1 - CBC Circles in the U.S.

File #2 - CBC Circles in Canada

File #3 - CBC Circles in South America

File #4 - CBC Circles in other areas not covered in other files

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