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.
Deel van: IOC Manuals and Guides. Intergovernmental Oceanographic Commission: Paris. ISSN 0251-6020, meer
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