format
A data.frame containing tree-ring indices and
replication depth with respective years as rownames.source
Fernandez-Cancio A, Genova Fuster M: Fernandez-Cancio -
Penota - PISY - ITRDB SPAI020,
http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:3255,
accessed 2014/07/03.