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[[image]] B.S. 16229 - Platform pen in use. Platform covered with river sand. Pen shaded with rushes bound in place by two willows. Bear River Laboratory. Mouth of Bear River, Utah. August 6, 1915. [[image]] B.S. 16234 - "Alkali boulevard" Bear River Field Laboratory and experimental pens for the study of duck diseases. Mouth of Bear River, Utah. August 9, 1915.