Some changes in the distribution of certain Minnesota birds in the last fifty years
By: by Thos. S. Roberts.  Breeding of the Connecticut warbler (Oporornis agilis) with special reference to Minnesota / by William Kilgore.  Breeding of Nelson's sparrow (Ammospiza nelsoni) with special reference to Minnesota / by Walter J. Breckenridge. A hybrid passerina (Passerina cyanea + Passerina amoena) / by Walter J. Breckenridge.
Contributors: Kilgore, William.; Breckenridge, Walter John, 1903-; Breckenridge, Walter John, 1903-; University of Minnesota. Museum of Natural History.
Series: Occasional papers -- no. 3; Occasional papers (Minnesota Museum of Natural History) -- no. 3
Publisher: University of Minnesota
Published: 1930
Place of publication: Minneapolis, Minn
Language: eng
Number of pages: 40
Subjects: Birds -- Minnesota
Other titles: Breeding of the Connecticut warbler (Oporornis agilis) with special reference to Minnesota.; Breeding of Nelson's sparrow (Ammospiza nelsoni) with special reference to Minnesota.; Hybrid passerina (Passerina cyanea + Passerina amoena)
Notes: At head of title: University of Minnesota.  Museum of Natural History.