question have been on sale in the State concerned to the general
public or in connexion with systematic instructional activities
at a price reasonably related to that normally charged in the
State for comparable works.

(c) The period referred to in sub-paragraph (a) shall be
five years except that:

(i) for works of the natural and physical sciences,
including mathematics, and of technology, the period shall
be three years;

(ii) for works of fiction, poetry, drama and music, and
for art books, the period shall be seven years.

(d) If the owner of the right of reproduction cannot be found,
the applicant for a licence shall send, by registered air mail,
copies of his application to the publisher whose name appears
on the work and to any national or regional information centre
identified as such in a notification deposited with the
Director-General by the State in which the publisher is
believed to have his principal place of business. In the absence
of any such notification, he shall also send a copy to the
international copyright information centre established by the
United Nations Education, Scientific and Cultural
Organization. The licence shall not be granted before the
expiration of a period of three months from the date of
dispatch of the copies of the application.

(e) Licenses obtainable after three years shall not be