select distinct substring(name,1,1) from stamps ,color_master,np_master where np_master.np_code=stamps.np_code and np_master.np='P' and color_master.color_code=stamps.color_code and color_master.color='Blue Grey and Black' and year(stamps.issue_date)=1972 order by substring(name,1,1)
IndianPost
Currency >> P >> Color >> Blue Grey and Black >> Issue Date >> year >> 1972 >> Alpha >> B >>