01102cam a22002891 4500 gs 41000087 DLC 20260227111346.0 891025s1939 sw a b 000 0 eng c gs 41000087 (OCoLC)20546778 U.S. Geol. survey. Library CU CU DLC premarc QE282 .A3 ser. C., no. 427 554.85 s Wickman, Frans E. Some graphs on the calculation of geological age, by Frans E. Wickman. With one plate. Stockholm, Kungl. Boktryckeriet, P.A. Norstedt & Söner, 1939. 8 p. incl. tables. fold. diagr. 24 cm. [Sweden] Sveriges geologiska undersökning. Ser. c. Avhandlingar och uppsatser. n:o 427. Årsbok 33 (1939) n:o 7 Bibliographical foot-notes. Geological time. Graphic methods. Graphs on the calculation of geological age. Ser. C--Avhandlingar och uppsatser. n:o 427. Årsbok (Sveriges geologiska undersökning) ; 33 : n:o 7. 27719 27719