Reference
- Hittelman , A. L. , Groman , R. C. , Haworth , R. T. , Holcombe , T. L. , McHendrie , G. and Smith , S. M. 1989 . The Marine Geophysical Data Exchange Format—'MGD77’ (Bathymetry, Magnetics, and Gravity) , Key to Geophysical Records Documentation No. 10, February (Revised) Boulder, CO : National Geophysical Data Center .