Smithsonian Institution: Robert Ridgway Bird Head Drawing 191014
Smithsonian Institution: Robert Ridgway Bird Head Drawing 248086
Smithsonian Institution: Robert Ridgway Bird Head Drawing 191016
Smithsonian Institution: Unnumbered Robert Ridgway Bird Head Drawing
Smithsonian Institution: Robert Ridgway Bird Head Drawing 30285
Smithsonian Institution: Unnumbered Robert Ridgway Bird Head Drawing
Smithsonian Institution: Robert Ridgway Bird Head Drawing 280
Smithsonian Institution: Robert Ridgway Bird Head Drawing 164
Smithsonian Institution: Robert Ridgway Bird Head Drawing 412
Smithsonian Institution: Robert Ridgway Bird Head Drawing 1165
Smithsonian Institution: Robert Ridgway Bird Head Drawing 279
Smithsonian Institution: Robert Ridgway Bird Head Drawing 410
Smithsonian Institution: Robert Ridgway Bird Head Drawing 32
Smithsonian Institution: Robert Ridgway Bird Head Drawing 99
Smithsonian Institution: Robert Ridgway Bird Head Drawing 40
Smithsonian Institution: Robert Ridgway Bird Head Drawing 270
Smithsonian Institution: Robert Ridgway Bird Head Drawing 45
Smithsonian Institution: Robert Ridgway Bird Head Drawing 23979
Smithsonian Institution: Robert Ridgway Bird Head Drawing 22374
Smithsonian Institution: Robert Ridgway Bird Head Drawing 401
Smithsonian Institution: Robert Ridgway Bird Head Drawing 38925
Smithsonian Institution: Robert Ridgway Bird Head Drawing 38926
Smithsonian Institution: Robert Ridgway Bird Head Drawing 22375
Smithsonian Institution: Robert Ridgway Bird Head Drawing 397
Smithsonian Institution: Robert Ridgway Bird Head Drawing 38169
Smithsonian Institution: Robert Ridgway Bird Head Drawing 41
Smithsonian Institution: Unnumbered Robert Ridgway Bird Head Drawing
Smithsonian Institution: Robert Ridgway Bird Head Drawing 23326
Smithsonian Institution: Robert Ridgway Bird Head Drawing 3940
Smithsonian Institution: Robert Ridgway Bird Head Drawing 291