This work is is in the public domain because it is a work of the Pakistan government that was published at least 50 years ago.
According to the Copyright Ordinance of Pakistan, 1962, amended 1992 - Ordinance No. XXXIV of 1962, Chapter III, section 22. "Term of copyright in Government works and in works of international organizations" :
- "Copyright in a Government work shall, where Government is the first owner of the copyright therein, subsist until fifty years from the beginning of the calendar year next following the year in which the work is first published."