=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Mar-1994
data up to 1991 revised, March 1994
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 15-Jul-1994
Dalhousie           970/046 RLR(1990) is 9.6m below BM-3 1964
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 04-Apr-2012
Last data received for Dalhousie is that for 1992.