This stunning instructional pull down map is dated 1970 and illustrates the Percent Change in Corn Yield Per Acre by Counties of the United States from 1939 - 1964. Map measures approximately 43"w x 28"h and is in very good overall vintage condition with only very minor wear.

Chart is mounted on thick canvas and fitted with stable pulldown-style wooden rods and can be mounted to your wall via standard hooks or hanging wire.