 | 1902 - 554 páginas
...preparation of such a work has necessarily delayed the beginning of its publication; but most of this drudgery having been disposed of, it is hoped that future progress may be more As to the scope of the work, the author says: " In the following pages the attempt is made to describe... | |
 | Robert Ridgway, Herbert Friedmann - 1901 - 796 páginas
...preparation of such a work has necessarily delayed the beginning of its publication; but most of this drudgery having been disposed of, it is hoped that...made to describe every species and subspecies, or detinable form, of bird found on the continent of North America, from the arctic districts to the eastern... | |
 | United States National Museum - 1901 - 906 páginas
...preparation of such a work has necessarily delayed the beginning of its publication; but most of this drudgery having been disposed of, it is hoped that...the following pages the attempt is made to describe ever}' species and subspecies, or definable form, of bird found on the continent of North America,... | |
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... collating references pertaining to more than 3,000 species of birds, verifying citations of original descriptions, measuring many thousands of specimens, and other time-consuming details connected with the preparation of such a work has necessarily... 