=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 14-Jul-2010 :
Data for Izvestia 1954-2000 were previously in the database these values were copied and stored in a box file on the top of one of the PSMSL roller front
cupboards. Revised data values for 1954-2009 were downloaded from the Arctic and Antarctic Research Institute website were downloded and added to the database. The RLR factor remains 7.000m as before.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 13-Aug-2013 :
Following the recent download of data it was noted that some of the historic values differed slightly. Because of this the whole dataset has been re-loaded.

