Taschenflora des Alpen-Wanderers /

Autor Schröter, Carl, 1855-1939
Vydáno 1930

Rocky Mountain flowers : an illustrated guide for plant-lovers and plant-users /

Autor Clements, Frederic E. 1874-1945, Clements, Edith S.
Vydáno 1928

Practical plant ecology : a guide for beginners in field study of plant communities /

Autor Tansley, A. G. Sir, 1871-1955
Vydáno 1923