1886-1938 NO. OF OBSERVATIONS PER DAY UNKNOWN =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 06-Feb-1997 1953 data revised in February 1997 =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 03-Mar-2000 Gdansk/Nowy Port 110/022 RLR(1997) is 14.0m below BM iron bolt Last data for Gdansk is 1999 due to data policy issues in Poland