select distinct paper from paper_master,color_master,np_master,stamps where stamps.paper_code=paper_master.paper_code and paper_master.paper<>' '  and np_master.np_code=stamps.np_code and np_master.np=\'P\'  and color_master.color_code=stamps.color_code and color_master.color=\'Olive Green\'  and year(stamps.issue_date)=1967  order by paper