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"Vesper sparrow" Roadside bird counts on BLM lands in Petroleum
and Fergus counties, Montana / submitted by Paul Hendricks; a
report to Bureau of Land Management, Lewistown Field Office. By:
Hendricks, P. - Montana Natural Heritage Program. - United
States. Publication info: Helena, Mont. :Montana Natural
Heritage Program,c2000. Contributed by: Montana State Library
(archive.org) Subjects: Baird's sparrow Bird surveys Birds
Brewer's sparrow Brown-headed cowbird Counting Fergus County
Geographical distribution Grasshopper sparrow Grassland birds
Lark bunting Long-billed curlew Montana Musselshell River
(Mont.) Petroleum County Ponderosa pine Roadside transect Sage
thrasher Sagebrush Savannah sparrow Short-eared owl Sprague's
pipit Upland sandpiper Vesper sparrow Western meadowlark