Dokumentation B 112.36311.12~. 

Index international periodieals.-International 
index to periodieals. Author and subjeet 
index to the humanities, soeial seiences 
ans science. Vol.XI.X~I.-New York: 
H.W.Wilson Comp.1950-52.8 

Vol. XI: April 1946-March 1949 

Vol.XII: April 1949-r.lareh 1952