When Squadron-Signal "reissues" a book

A new number is not a re-issue, but a completely new book on the same subject, re-issues of old books are done under the same number and revised one will also have the same number, but show revised on the cover. New books are done years after the first one and have the advantage of more material becoming available

Either way, it figures - and either way I'd end up getting the newer version anyway - I can't stand not having a reference book for a subject I am fond of.  Must be nice to be able to correct your inaccuracies and charge the consumer all over again for the luxury of having the right information.  Sort of like government work.....

Number 84 was an earier issue then number 191. Number 191 will be more thourgh and accurate of the two