The answer key to the instrumentation book starts on page 23-51 or page 336/598
If you had downloaded the torrent you might find that page 23-52 is missing and contains answers from chapter 4 to chapter 11
In the book this page is omitted
Someone had uploaded the answer key earlier and i had made a copy of it
If anyone would like the copy of the missing page answer key pm me your email address and i will send it as a pdf file
Happy Studying