It's just come to my attention that the NY Times has its archive of film 
reviews online:

(Registration may be required to view this page, but it should be free.)

I don't know how far back it goes, or if they charge for some reviews, 
but, still, it's an amazing resource.  For example, it's fascinating to 
read Bosley Crowther's review of CITIZEN KANE from 2 May 1941:


Published: May 2, 1941

Within the withering spotlight as no other film has ever been before, 
Orson Welles's Citizen Kane had its world premiere at the Palace last 
evening. And now that the wraps are off, the mystery has been exposed, 
and Mr. Welles and the RKO directors have taken the much-debated leap, 
it can be safely stated that suppression of this film would have been a 
crime. For, in spite of some disconcerting lapses and strange 
ambiguities in the creation of the principal character, Citizen Kane is 
far and away the most surprising and cinematically exciting motion 
picture to be seen here in many a moon. As a matter of fact, it comes 
close to being the most sensational film ever made in Hollywood.

For more:

Jeremy Butler

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