Thế Pennsylvania (Vietnamese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Thế Pennsylvania" in Vietnamese language version.

refsWebsite

Global rank Vietnamese rank

1stratigraphy.org

2,562^nd place

874^th place

1books.google.com

3^rd place

6^th place

books.google.com

Gradstein, Felix M.; James G. Ogg; Alan G. Smith (2005). A Geologic Time Scale 2004. Cambridge University Press. tr. 288. ISBN 978-0-521-78673-7.

stratigraphy.org

“ICS Timescale Chart”. www.stratigraphy.org.