Title Genres Topics Date (Start) Date (End)
Opal Uher letter to James J. Dinsmore regarding a request to purchase a Peter C. Petersen publication, August 9, 1988 Correspondence Field notes Bird feeders Bird watching Birds--Nests Birds--Research Ornithology--Societies, etc Birds--Infancy 1988-08-09 N/A
Paul Martsching letter to Robert K. Myers regarding bird sightings, spring 1988 Correspondence Field notes Bird watching Birds--Identification Birds--Research 1988-03-01 1988-05-31
Pearl Knoop letter to Nicholas S. Halmi regarding bird sightings, May 31, 1978. Correspondence Field notes Bird watching Birds--Migration Birds--Research 1978-05-31 N/A
Pearl Knoop letter to Peter C. Petersen regarding bird sightings, December 7, 1963 Correspondence Field notes Bird watching Birds--Research Ornithology--Methodology 1963-12-07 N/A
Pearl Knoop letter to Peter C. Petersen regarding bird sightings, June 10, 1964 Correspondence Field notes Bird populations Bird watching Birds--Migration Birds--Research Ornithology--Methodology 1964-06-10 N/A
Pearl Knoop letter to Peter C. Petersen regarding fall migration, August 17, 1963 Correspondence Field notes Bird watching Birds--Migration Birds--Nests Birds--Research Ornithology--Methodology 1963-08-17 N/A
Pearl Knoop letter to Peter C. Petersen regarding fall migration, December 15, 1962 Correspondence Field notes Bird watching Birds--Migration Birds--Research Ornithology--Methodology 1962-12-15 N/A
Pearl Knoop letter to Peter C. Petersen regarding field notes, winter 1963 Correspondence Field notes Bird watching Birds--Research Ornithology--Methodology 1963-04-08 N/A
Pearl Knoop letter to Peter C. Petersen regarding nesting season, August 21, 1964 Correspondence Field notes Bird watching Birds--Migration Birds--Nests Birds--Research Ornithology--Methodology 1964-08-21 N/A
Pearl Knoop letter to Peter C. Petersen regarding spring migration, June 4, 1963 Correspondence Field notes Bird watching Birds--Migration Birds--Research Ornithology--Methodology 1963-06-04 N/A
Pearl Knoop letter to Thomas H. Kent regarding bird sightings, March 4, 1980 Correspondence Field notes Bird watching Birds--Research Ornithology--Methodology 1980-03-04 N/A
Peter C. Petersen letter and checklist to Nicholas S. Halmi regarding fall migration, 1976 Correspondence Field notes Bird banding Bird watching Birds--Research Trapping 1976-12-05 N/A
Peter C. Petersen letter to Nicholas S. Halmi regarding bird sightings and bird banding, November 29, 1977 Correspondence Field notes Bird banding Bird watching Birds--Counting Birds--Research Tyrannidae | Flycatchers Turdidae | Thrushes Vireonidae | Vireos Parulidae | Warblers 1977-11-29 N/A
Peter C. Petersen letter to Nicholas S. Halmi regarding bird sightings, May 23, 1978 Correspondence Field notes Bird watching Birds--Research 1978-05-23 N/A
Peter C. Petersen letter to Nicholas S. Halmi regarding fall migration, 1976 Correspondence Field notes Bird watching Birds--Research 1976-08-23 N/A
Peter C. Petersen letter to Nicholas S. Halmi regarding winter bird sightings, February 10, 1979 Correspondence Field notes Bird feeders Bird watching Birds--Counting Birds--Research Anseriformes | Ducks, Geese, and Swans Laridae | Gulls and Terns Accipitridae | Hawks and Eagles Fringillidae | Finches Water birds 1979-02-10 N/A
Peter C. Petersen letter to Nicholas S. Halmi, regarding bird sightings, July 30, 1977 Correspondence Field notes Bird watching Birds--Research 1977-07-30 N/A
Peter C. Petersen letter to Thomas H. Kent regarding bird sightings, July 29,1979 Correspondence Field notes Bird watching Birds--Counting Birds--Research 1979-07-29 N/A
Peter C. Petersen letter to Thomas H. Kent regarding summer bird sightings, August 4, 1981 Correspondence Field notes Bird populations Bird watching Birds--Counting Birds--Research Ornithology--Methodology 1981-08-04 N/A
Peter C. Petersen letters to Nicholas S. Halmi regarding bird sightings, February 12, 1978 Correspondence Field notes Bird watching Birds--Research 1978-02-12 1978-02-26
Philip A. DuMont letter to Martin L. Grant regarding suggestions to the "Check-list of Iowa Birds", December 7, 1962 Correspondence Bird watching Birds--Identification Birds--Nomenclature Birds--Research Ornithology--Methodology 1962-12-07 N/A
Photograph of a male and female Wood Duck in a tree Photographs Birds--Habitat Birds--Research Wood duck--Behavior 1965-01-01 1965-12-31
Photograph of a male and female Wood Duck in a tree Photographs Birds--Habitat Birds--Research 1965-01-01 1965-12-31
Photograph of a mother Wood Duck and ducklings inside a duck house Photographs Birds--Research Birdhouses Ducklings Wood duck--Behavior 1966-01-01 1966-12-31
Photograph of a mother Wood Duck and ducklings walking on grass Photographs Birds--Research Ducklings Wood duck--Behavior 1966-01-01 1966-12-31