उपनिषद् <br/><br/>
रहस्योपनिषद् [mss.] 

 - Pennsylvania  Institute for Advanced Studies of World Religions 
 - 3fols  positive  10.5cm.x15cm. 
<br/><br/> Sans/Devanagari-1838 A.D.-Paper-microfiche-Coll.:IASWR,Pennsylvania.