There is an earlier reference for the dissection of squares for 12+22+22=32 than the Dudeney 1907 reference. Sam Loyd gave two different 4-piece dissections of squares for 12+22+22=32 on page 59 of the November 1904 issue of the Woman's Home Companion.
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Piano-hinged Dissections: Time to Fold!
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Last updated August 12, 2008.