Along the lines of what Frank said... Goudey cards are not like T206, E121, etc. cards (ie the ones that are easily soaked). The back is a very thin layer of paper that includes the printing on it--and it is lighter than the underlying card stock that makes up the bulk of the thickness of the card.
I know this as many years ago I got a scrapbook with several Goudey cards in it and those 1934 Goudey's do not soak worth a dang due to their construction. I ruined a common or two before I threw in the towel and sold them "as is". The glue was not the right type to really soak well either.
-Rhett
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