Water-column total Th-234 with 4 L method and U-238 from U-salinity relationship 
 PI: Ken Buesseler (WHOI) 
 Version: 31 Dec 2012 
  Revised: 25 Feb 2013. Corrected event numbers of KN199-04 station 5 cast 4   
  from 2075 to 2091 and KN204-01 station 18 cast 6 from 3203 to 3204 
  (due to corrections in bottle file). 
  
 Please note that data may not be final, pending intercalibration results and 
 further analysis. If you are interested in following changes to US GEOTRACES 
 NAT data, there is an RSS feed available via the BCO-DMO US GEOTRACES  
 <a href="http://www.bco-dmo.org/project/2066" target="_blank">project page</a>.