00414cam a2200157ua 45000010005000000080039000050400009000440820011000531000045000642450041001092500009001502600039001593000017001986530014002156530027002291905110806n        ii  |||gr||||Z||||||eng  cMAIN  a371.33  aDas, B. C.,d1996,q(Bishnu Charan Das).1 aEducational technplogycby B. C. Das  a1st.  aLudhiana:bKalyani Publishers,996.  a162p:c23cm.  aEducation  aEducational technplogy