C 128.793~. 

Periodicals"':directory Ulrichli\ international.Ulrich's 
international Periodicals Directory. 
A classified guide t6 current periodicalsforeign and domestic. 16. ed; 1975-i976.-. 
NÖw York (usw.]: Bowker 1975, XLIII, 2289 S. 
4 
(Bowker Serials Bibliography.)