select distinct substring(name,1,1) from stamps ,paper_master,np_master where np_master.np_code=stamps.np_code and np_master.np='P' and paper_master.paper_code=stamps.paper_code and paper_master.paper='Unwatermarked adhesive coated paper' and year(stamps.issue_date)=1973 order by substring(name,1,1)
IndianPost
Currency >> P >> Paper >> Unwatermarked adhesive coated paper >> Issue Date >> year >> 1973 >> Alpha >> R >>