Worth knowing classic?

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Avatar of AlekhinKasparov

Right now I am studying Alekhine's chess life. I like his style and plan diversification for different positions. I read about Bogoljubov and his interesting personality. 

Worth it to study some games from these World Chess Championships ? If you have some suggestions, comment below.  

 

Alekhine-Bogoljubov 1929

Euwe - Alekhine 1937