Title Genres Topics Date (Start) Date (End)
Letter to Carol A. Thompson regarding work on Breeding Bird Atlas, October 11, 1991 Correspondence Research notes Bird populations Bird surveys Environmental monitoring 1991-10-11 N/A
Erik Munson letter to the members of Big Bluestem Audubon Society regarding the Boone County Christmas Bird Count Correspondence Bird surveys Bird watching Birds--Counting 1990-01-01 1990-12-31
Mark Widrlechner letter to Hank Zaletel regarding the Boone County Christmas Bird Count Correspondence Bird surveys Bird watching Birds--Counting Ornithology--Methodology 1996-01-01 1996-12-31
Mark Widrlechner letter to Boone County Bird Count Participants regarding the 1999 Christmas Bird Count results, January 9, 1999 Correspondence Field notes Bird surveys Bird watching Birds--Counting Ornithology--Methodology 1999-01-09 N/A
Special spring bird census flyer Correspondence Fliers (printed matter) Bird surveys Bird watching Birds--Counting Birds--Migration 1970-05-10 N/A