Do you know who's art this is or it's value?

I have a 20x 24 looks like sketch of multiple men/hobos/clowns/ on the side it says 22, sketchbook,copyright IRA Roberts Publishing,inc 1970,Litho in USA. The frame is broken but has a number M502/5225. There may be a signature under a leg of a man sitting but I'm not sure.
Asked Oct 29, 2014

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