Iowa.

est. 1920 · 2,001 acres · Delaware County, IA ~3 mi south of Strawberry Point

est. 1921 · 1,653 acres · Keosauqua, Van Buren County, southeastern Iowa, along a bend of the Des Moines River.

est. 1924 · 1,117 acres · Boone County, IA (about 4 miles south of Boone, ~15 miles west of Ames)

est. 1933 · 370 acres · Jackson County, IA (near Maquoketa)

est. 1935 · 964 acres · Clayton County, IA (near McGregor)