Gyrfalcon (2012-007)
Contributing photographers indicated by (ph.)

Initial observer(s):
Mark A. Chappell (ph.)

Corroborating observers and additional sources:
Douglas W. Aguillard (ph.)
Thomas A. Blackman (ph.)
Dave Furseth (ph.)
William Hopson (ph.)
Curtis A. Marantz (ph.)
Guy McCaskie
Chet McGaugh (ph.)
Larry Moskovitz (ph.)
Stephen J. Myers (ph.)
David W. Nelson (ph.)
Christopher Taylor (ph.)

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