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Per A. Rydberg

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The N-alkyl Edman Method Mechanisms and Application for Identification of Mutagens in the General Environment
Flora of the Prairies and Plains of Central North America
Scandinavians Who Have Contributed to the Knowledge of the Flora of North America
Catalogue of the flora of Montana and the Yellowstone National Park
Flora of the Rocky Mountains and Adjacent Plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and Neighboring Parts of Nebraska, South Dakota, and British Columbia
A monograph of the North American Potentilleae
Flora of the Prairies and Plains of Central North America