(5) “book” means(a) a non-periodical printed publication containing not less than 48 pages of text or illustrations or both, not including the cover pages, regardless of how it is assembled;
(b) a non-periodical printed publication which is a collection of poems, containing not less than 32 pages of text or illustrations or both, not including the cover pages;
(c) a non-periodical printed publication intended for children, containing not less than 16 pages of text or illustrations or both, or in the form of cartoons with or without text, bound in paper or hardback;
(d) a non-periodical printed publication, presented in the form of cartoons for adults, containing not less than 16 pages, with text, bound in paper or hardback;
(e) a non-periodical printed publication dealing solely with music, bound in paper or hardback, or an instrument method or music score, regardless of the number of pages;
(f) a serial publication, whether of material described in subparagraphs a to e, in several parts, or of volumes published successively under a common title over an undefined period but not necessarily at regular intervals;but excluding school manuals.