1
   
5
   
8
   
18
Published: Riga, Izdat. Akademii Nauk Latvijskoj SSR, 1953
   
19
Published: Riga, Izd. Akad. nauk Latvijskoj SSR; Institut ėkonomiki Akademii nauk Ėstonskoj SSR, 1959
   
20
Published: Berlin [u.a.], Verl. f. Sozialwissenschaften, 1950
   

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