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West side of the Lake Calvin Basin seen from the heights north of Columbus Junction, Iowa, June 14, 1924

Looking North. Lake Calvin is now known as Goose Lake.

Erosion in till and loess, Cass Township, Iowa, July 18, 1924

Located in Cass Twp., middle of north line of south section 6, just west of Panora.

Top picture: Dodgeville peneplain at an elevation of 1260 ft., Asbury, Iowa, 1920s. Bottom picture: Lancaster peneplain northeast of Waukon, Iowa, 1920s

Iowan Drift area topography, Spring Rock Township, Iowa, June 18, 1925

Located in Spring Rock Twp. on the middle of line between sections 6 and 7.

Kansan topography, Welton Township, Iowa, June 18, 1925

Located in the middle of section 4 of Welton Township.

Two tills and two loesses, Iowa, June 18, 1925

Located in the west of corner of sections 20, 21, 28, and 29.

Iowan Drift area topography, Boulder Township, Iowa, June 19, 1925

Located in Boulder Twp., corner of sections 1, 2, 11, and 12.

Iowan Drift area topography, Hazel Green Township, Iowa, June 19, 1925

Located in the south part of line between sections 28 and 29 in Hazel Green township.

Boulder field in Iowan area, Williamstown, Iowa, June 19, 1926

Located 3/4 mile South of Williamstown, East side of road, near middle of line between sections 13, Richland Twp., and 18, Dresden Twp.

Men on pile of boulders, Forest City township, Iowa, July 4, 1925

Forest City Twp., lane between sections 13 and 32

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