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The possessive form of folks is formed by adding an apostrophe: folks'
Viola Eisenbise has written:
'Primary folks at mission study' -- subject(s): Juvenile literature, Missions
Yes ther are plenty of them. One that comes to mind is the folks at www.PennFoster.edu. With them they can help you study this trade from home.
Nathan Folks's birth name is Nathaniel Thomas Conrad Folks.
"Plain folks" is a noun phrase. It refers to ordinary or average people in society.