John, T. George. <br/><br/>
Measurement of time and evolution of calendars (studies)/ 
T. George John 
 - [Aluva, Kerala] :  Pen Books,  2003 
 - 55 p. :  ill.;  21 cm. 
<br/><br/> "A treatise 'de Novo' with Revolutionary information" 
<br/><br/><label>ISBN: </label> Rs.35.00(pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calendars<br/>Chronology<br/>Time measurements
<br/><br/><label>Dewey Class. No.: </label>529.5