Rydberg Axel

Flora Of The Rocky Mountains And Adjacent Plains

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

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

Flora Of The Black Hills Of South Dakota

Flora Of The Sand Hills Of Nebraska

North American Flora, Vol. 22: Part 6, Rosaceae (Conclusio); Additions And Corrections (Classic Reprint)

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

A Monograph, North American Potentilleae (Classic Reprint)

A Monograph Of The North American Potentilleae

Flora Of The Black Hills Of South Dakota

Key To The Rocky Mountain Flor

Flora Of The Black Hills Of South Dakota