my first reaction would be: "that's impossible, such a book doesn't exist !", but seriously: i don't know about a PDF, but a quick search on Internet yealded a host of hits on the search criterium "teach yourself cobol in 21 days". Yes, it IS that simple.
Try
for an HTML online version. You can always copy the pages if you want them at home.
I haven't read it in detail (i already know COBOL), but it looked pretty good to me.
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