Malmstrom, V H <br/><br/>
Origin of the mesoamerican 260-day calendar.  [electronic resource] 

 -  Science (New York, N.Y.)  Sep 1973 
 - 939-41 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0036-8075 
<br/><br/><label>Standard No.: </label>10.1126/science.181.4103.939  doi