Ludfordiano (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ludfordiano" in Portuguese language version.

refsWebsite

Global rank Portuguese rank

1stratigraphy.org

2,562^nd place

1,793^rd place

1britannica.com

40^th place

17^th place

britannica.com

Ludfordian Stage - Encyclopædia Britannica

stratigraphy.org

(em inglês) «International chronostratigraphic chart (2012)» (pdf). www.stratigraphy.org .