999 has been sending me interesting links for years. Today, he sent me this one:
http://www.loc.gov/folklife/LP/AFS_L61_opt.pdf

Turned out to be the liner notes for Archive of Folk Song LP #61, a collection of railroad songs.

That inspired me to go to loc.gov and search for archife of folk song (singular). It's going to take me weeks to go through all the treasures I found!

Thanks, 999!!!

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Look at this: How to do research in the Archive of Folk Culture
-Joe-