What passages in of Mice and Men suggest that the story takes place during the Great Depression?

The whole movie takes place during that time - it's clear to see.What passages in of Mice and Men suggest that the story takes place during the Great Depression?
Migrant workers were common in that period. Any statement indicating L and G are migrant workers.





Any statements that might indicate friction between landowning class and working class is typical of the socialist rhetoric of that period.





Any ref to dust bowl would also be relevant.What passages in of Mice and Men suggest that the story takes place during the Great Depression?
http://www.bbc.co.uk/bitesize/

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