136. Reudink, M. W., S. G. Mech, S. P. Mullen, and R. L. Curry. 2007. Structure and dynamics of the hybrid zone between Black-capped and Carolina chickadees in southeastern Pennsylvania. Auk 124: 463-478.
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136. Reudink, M. W., S. G. Mech, S. P. Mullen, and R. L. Curry. 2007. Structure and dynamics of the hybrid zone between Black-capped and Carolina chickadees in southeastern Pennsylvania. Auk 124: 463-478.
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