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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Unknown from SE USA (1 Viewer)

2nd is primary from right wing of Amer. turkey.
1st is again from right side, guessing a secondary from some sort of waterfowl.
 
feather 1 is close to common buzzard in Europe
http://www.fotosearch.com/CSP958/k9588316/
http://www.flickr.com/photos/farmer55/4574711048/

Perhaps feather is wrong size? I am not sure about feathers of Buteo species in U.S.A.

Having a another look, believe your on right track, Roy
Heres a site US fish & wildlife (forensics) maintains for feather ID.
Dimensions are skewed a bit by feather being flattened while scanning for images used by site.
Really a nice site. Going to slip an extra buck in envelope for federal rec area am going to shortly, because of it.

http://www.lab.fws.gov/fa/index.php
 
Inclined to agree with juv Broad-Wing. Pattern of dark tone migrating across anteriour to posteriour is very close. Bars look good. Feathers when scanned are flattened, imagining OP's the same brings it even closer to dimensional match. Juv Broad-wing scan, "Feather 8" in feather atlas seems like likely candidate, with "feather 9" close behind.
 
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