That brings back memories of looking up answers in my early days with Taxpayer Service, 45 years ago.  Back before we had the Internet, it was helpful when Pub 17 didn't supply the answer.  (I just noticed that J K Lasser still puts a new cover on Pub 17 and sells it to unsuspecting buyers.  Well, maybe they add content these days.  Does anyone remember the TV sitcom that starred a Lasser?)  

Back then, the publisher was CCH (Commerce Clearing House), a venerable Chicago company that was bought out by the Dutch a decade or so ago.  They also published a multi-volume (11? 17?) research guide with looseleaf pages that had to be removed and replaced regularly.  You either trained with CCH and didn't like their competitor Prentice-Hall, or you trained with Prentice-Hall and disrespected CCH.