The 1930s was the cinema's age of innocence, a time when the emphasis was on escapism and entertainment. Cary Grant and Katharine Hepburn were Bringing Up Baby, Busby Berkely's precision-drilled chorus girls were Flying Down to Rio, Fred Astaire was donning his Top Hat, and John Wayne was climbing on the Stagecoach to stardom. As this stunning collection of poster art reveals, it was also the decade of the illustrator, with Al Hirschfeld, Hap Hadley,...