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1. Peat deposits of Minnesota, Bulletin 16, Plate 1

1919. Soper, E.K. Peat Deposits of Northern Minnesota.

2. Peat deposits of Minnesota, Bulletin 16, Plate 2

1919. Soper, E.K. Peat Deposits of Beltrami County, Minnesota, showing location of soundings and depth of peat and topography of the surface of the bogs north of Red...

3. Peat deposits of Minnesota, Bulletin 16, Plate 3

1919. Soper, E.K. Peat Deposits of Koochiching County Minnesota, showing locations of drainage ditches, scale 1 inch = about 4 miles.

4. Peat deposits of Minnesota, Bulletin 16, Plate 4

1919. Soper, E.K. Map showing Peat Deposits of Itasca County Minnesota, scale 1 inch = about 4 miles.