code_name,Digitization method
units,NODC code 0612
01,MANUAL
02,A-D CONVERSION FROM ORIGINAL
03,A-D CONVERSION FROM COPIES
04,OPTICAL SCANNING
05,DIRECT DIGITAL OUTPUT UNKNOWN
06,DIRECT DIGITAL OUTPUT BATHY
07,DIRECT DIGITAL OUTPUT SUTRON
08,DIRECT DIGITAL OUTPUT FROM SIPPICAN MARK 9