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Front Matter

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Carl Bodmer's Paintings As Ethnographic Documents
Joan Rupp

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Changing Social Relationships in an Eastern Dakota Community
Cynthia Kelsey

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Abstract Paper

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A Basis For Forest Tree Seed Collection Zones in the Lake States
Paul O. Rudolf

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Verical Migration of a Spherical and Aspherical Pollen in a Sphagnum Bog
John R. Rowley and Joanne Rowley

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The Cytology of Caltha L.
A. Orville Dahl and John R. Rowley

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Observations on the Morphology of "Reversed Germ" in Two Lines of Dent Corn
Gertrud S. Joachim

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Geochemical Exploration For Hidden Ore Deposits
D. H. Yardley

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Abstract Papers

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Vinyl Polymers Containing Acidic Ingredients
Courtland L. Agre

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Use of Radioisotopes in the Study of Surface Phenomena in Detergency Operations. III. Study of Surface Memory for Spot Formation
W. W. Benton, A. T. Martin, C. H. Shiflett, and J. L. Wilson

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Abstract Paper

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Exhaustive Extractions of a Minnesota Peat
Moses Passer

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The Development of Miniature Pumps
Carl A. Miller

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Definition of Science, An Operational Classroom Technique
David G. Barry

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Technique For Demonstrating The Chromosomes in the Salivary Glands of the Fruit Fly, Drosophila melanogaster
M. M. Keith

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The Development of a General Education College Chemistry Course
Luther Arnold

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The Mechanism of Temperature Induced Reduction of Tumor Frequency in a Tumorous Strain of Drosophila melanogaster
R. A. Kroman