April 21, 1990 - Gaylord Nelson, former Wisconsin U.S. Senator, discusses the founding of first Earth Day 1970.
April 20, 1990 - A profile of one of America's most influential environmental writers, Aldo Leopold, who was also an accomplished biologist.
January 29, 1990 - Documentary report on heart transplantation, its rise over the last decade, and the shortage of donor organs.
January 27, 1990 -
January 27, 1990 -
January 13, 1990 - Minnesota Historical Society president Nina Archabal takes listener's questions about Minnesota history.
December 30, 1989 -
December 30, 1989 -
December 16, 1989 -
November 25, 1989 -