FWS= Farmer's Wife Sampler.
The blocks are from a book The Farmers Wife Sampler Quilt - Letters from 1920's farm wives and the 111 blocks they inspired.
There is/was a block of the month here on the board. There is also one for the Farmers Wife Pony Club Sampler Quilt - Letters from the lucky pony winners of 1915 and the 90 blocks that tell their stories.
I've just ordered the books. Even if I don't make any of the blocks, the books promise to be fascinating.
http://www.thefarmerswifequilt.com/index.html