=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Ciudad Madero       920/066 RLR(1964) is 9.4m below BM1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Ciudad Madero       920/066 RLR(1964) is 9.4m below BM1
Ciudad Madero is an historic station last data 1979