Field reports reveal surprising bird behavior patterns in summer 1986.
Field reports for the summer of 1986 were submitted by James J. Dinsmore to the Iowa Ornithologists' Union Quarterly.
Birdwatcher Jim Dinsmore's 1998 summer field report reveals rare bird sightings.
Handwritten field reports reveal surprising discoveries in summer 1990.
Birdwatching data reveals surprising bird species trends in Iowa.
