Prahlad Singh. <br/><br/>
Stone observatories in India :  erected by Maharaja Sawai Jai Singh of Jaipur (1686-1743 A.D.) at Delhi, Jaipur, Ujjain, Varanasi, Mathura / 
Prahlad Singh ; assisted by Pandit Kalyan Dutt Sharma. 
 - Varanasi :  Bharata Manisha,  1978. 
 - xiii, 216p. ;  24cm. 
 - Bharata Manisha research series. 11 .
<br/><br/><label>ISBN: </label>  Rs.100 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy--History--India.<br/>Astronomy, Ancient.<br/>Astronomical observatories.<br/>Astronomical instruments.<br/>Astronomy, Hindu--India.
<br/><br/><label>Dewey Class. No.: </label>522.1954