Title Genres Topics Date (Start) Date (End)
Waterfowl conditions in the Missouri Valley Reports Birds--Migration Anseriformes | Ducks, Geese, and Swans Wildlife conservation Wildlife refuges Waterfowl N/A N/A
Waterfowl migration survey, Missouri River, November 27, 1994 Field notes Forms (documents) Surveys (documents) Bird watching Birds--Counting Birds--Migration Weather Waterfowl 1994-11-27 N/A
Winter censuses, Ames, Iowa, January-March 1971 Field notes Charts (graphic documents) Bird watching Birds--Counting Birds--Migration 1971-01-16 1971-03-07
Woodward H. Brown letter to Peter C. Petersen regarding winter migration, April 2, 1966 Correspondence Field notes Bird watching Birds--Migration Birds--Research Ornithology--Methodology 1966-04-02 N/A
Woodward H. Brown letter to Peter C. Petersen regarding winter migration, March 19, 1966 Correspondence Field notes Bird watching Birds--Migration Birds--Research Columbiformes | Doves and Pigeons Sittidae | Nuthatches Ornithology--Methodology 1966-03-19 N/A