Many stations on the Gulf coast have large values for September 1961.
Documentation added 2012-02-09
St. Marks is now an Historic Station. Last data received was that for 1975. Although there are entries for both St. Marks Lighthouse and St. Marks City and the latter does list an earlier benchmark 6 the reference to this and the TGZ does not tally with the value from the original RLR diagram.