TY  - SER
AU  -  Bowditch, Charles P. 
TI  -  On the Age of Maya Ruins 
AV  - F1401 
PY  - 2012///
PB  -  Project Gutenberg, 
KW  -  Maya calendar
N1  -  Public domain in the USA;  Text
UR  -  http://www.gutenberg.org/ebooks/39310
ER  -