GF3: a general formatting system for geo-referenced data. Volume 1: introductory guide to the GF3 formatting system
(1993). GF3: a general formatting system for geo-referenced data. Volume 1: introductory guide to the GF3 formatting system. IOC Manuals and Guides, 17. UNESCO: Paris. iv, 33 pp.
Deel van: IOC Manuals and Guides. Intergovernmental Oceanographic Commission: Paris. ISSN 0251-6020, meer
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