ELENCO DEI CAMBI 
XXI 
Svezia. 
Stockholm. — Geologiska fóreningen i Stockholm. 
Fòrhandlingar [bd. XII, 1890]. 
— K. Svenska Vetenskaps Akademien. 
Arkiv fòr Remi, Mineralogi och Geologi [bd. 2, 1905], 
Arkiv for Zoologi [bd. 3, 1906]. 
Arkiv fòr Botanik [bd. 5, 1905]. 
Upsala. — Geoìogical Institution of tlie University of Upsala (Bi- 
bliothèque de l’Uuiversité R.). 
Bulletin [voi. I, 1892J. 
Svizzera. 
Zurich. — Naturforschende Gesellschaft. 
Vierteljahrssehrift [anno LV, 1910]. 
Indirizzo: Bibliothèque centrale de Zurich. Bureau d’échange 
de « Naturforschende gesellschaft ». 
Africa. 
Pretoria. — Geoìogical Survey (Department of Agricolture^. 
Memoirs [n. 10, 1917]. 
Annual report [1°, 1896]. 
Johannesburg. — Geoìogical Society of South Africa. 
Transactions [voi. VI, 1904]. 
Proceedings [anno 1905]. 
America. 
Baltimore. (U. S. A.) — Maryland Geoìogical Survey. 
Reports [voi. I, 18971. 
Berkeley, California. (U. S. A.) — University of California. 
Bulletin of thè department of Geology [voi. 5, 1906]. 
Buenos-Aires (R. Argentina). — Instituto geografico Argentino. 
Boletin [t. X, 1889j. 
— Ministerio de Agricultura. División de Minas, Geologia è 
Hidrologia. 
Anales [t. IV, 1910]. 
