..."There is one factor that has militated against the condor more thanany other one thing; namely, the restriction in its food source... 
William T. Hornaday 「Our Vanishing Wild Life」
...The finefor molesting a condor should be raised to $500, with a longprison-term as an alternative...
William T. Hornaday 「Our Vanishing Wild Life」
...The Condor, VII, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor, V, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor, VI, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor, VIII, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor, VIII,pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor,XIII, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor, X, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor, V,pp...
Frank M. Chapman 「Color Key to North American Birds」
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