NGVD29 (1929) Sea Level Datum of 1929 1929 Sea Level Datum Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 NGVD English NGVD29 NGVD Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 Sea Level Datum of 1929 NGVD29 (1929) NGVD29 (Sea Level Datum 1929)