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The Geological and Natural History Survey of Minnesota. The nineteenth annual report for the year 1890.

Winchell, N.H. (Minnesota Geological Survey, 1892)
Summary of the geological and natural history studies carried out in Minnesota during 1890.

The Geological and Natural History Survey of Minnesota. The seventeenth annual report for the year 1888.

Winchell, N.H. (Minnesota Geological Survey, 1889)
Summary of the geological and natural history studies carried out in Minnesota during 1888.

The Geological and Natural History Survey of Minnesota. The eighteenth annual report for the year 1889.

Winchell, N.H. (Minnesota Geological Survey, 1890)
Summary of the geological and natural history studies carried out in Minnesota during 1889.

The Geological and Natural History Survey of Minnesota. The sixteenth annual report for the year 1887.

Winchell, N.H. (Minnesota Geological Survey, 1888)
Summary of the geological and natural history studies carried out in Minnesota during 1887.

The Geological and Natural History Survey of Minnesota. The fifteenth annual report for the year 1886.

Winchell, N.H. (Minnesota Geological Survey, 1887)
Summary of the geological and natural history studies carried out in Minnesota during 1886.