GF3: a general formatting system for geo-referenced data. Volume 2: technical description of the GF3 format and code tables
(1987). GF3: a general formatting system for geo-referenced data. Volume 2: technical description of the GF3 format and code tables. IOC Manuals and Guides, 17. UNESCO: Paris. iv, 42 + annexes pp.
Part of: IOC Manuals and Guides. Intergovernmental Oceanographic Commission: Paris. ISSN 0251-6020