Books by E. Hackel
Sulla cleistogamia nelle Grami
Sulla cleistogamia nelle Graminacee
Gramineae novae
Gramineae novae
Notes on Philippine gramineae
Notes on Philippine gramineae
Neue Gräser aus Mexico
Neue Gräser aus Mexico
Catalogue des Festuca des Alpe
Catalogue des Festuca des Alpes Maritimes
Monographia Festucarum europaearum