ELENCO DEI CAMBI 
XXI 
Svezia. 
Stockholm. — Geologi sica fòreningen i Stoclcholm. 
Fòrhandlingar [bd. XII, 1890J. 
— K. Svenslca Vetenslcaps Alcademien. 
Arkiv fór Remi, Mineralogi och Geologi [bd. 2, 1905]. 
Arkiv fbr Zoologi [bd. 3, 1906]. 
Arkiv fór Botanik [bd. 5, 1905]. 
Upsala. — Geological Institution of thè University of Upsala (Bi- 
bliothèque de l’Université R.). 
Bulletin [voi. I, 1892]. 
Svizzera. 
Zurich. — Naturforschende Gesellschaft. 
Vierteljahrssehrift [anno LY, 1910], 
Africa. 
Pretoria. — Geological Survey. (The Librarian, Department of Agri¬ 
colture). 
Memoirs [n. 10, 1917]. 
Annual report [1°, 1896]. 
Johannesburg. — Geological Society of South Africa. 
Transactions [voi. VI, 1904]. 
Proceedings [anno 1905]. 
America. 
Baltimore. (U. S. A.) — Maryland Geological Survey. 
Reports [voi. I, 1897). 
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, 1889]. 
— Ministerio de Agricultura. División de Minas, Geologia e 
Hidrologia. 
Anales [t. IV, 1910]. 
