Thanks to Rayvi Sunico for leading me to this link on DEPARTMENT ORDER NO. 57-2011
09 December 2011 at the Department of Finance website. It will greatly be of help to me as a school librarian ordering and acquiring imported books off shore. There's a downloadable PDF on the Florence Agreement which mentions that books bought by libraries are exempt from tax duties. But, of course.
As a government protocol, registration is the next step for libraries who wish to be exempt from tax duties.
My question is: Is it worth going through all the trouble of registration so that libraries can save from book purchases abroad?