Rydberg Per Axel

Flora Of The Black Hills Of South Dakota

Flora Of The Sand Hills Of Nebraska

Catalogue Of The Flora Of Montana And The Yellowstone National Park (1900)

A Monograph, North American Potentilleae (Classic Reprint)

Scandinavians Who Have Contributed To The Knowledge Of The Flora Of North America, Volume 1907, Part 1

A Monograph Of The North American Potentilleae

Flora Of The Black Hills Of South Dakota