Copies are now sold through the office of the IAGA Secretariat. This Guide provides comprehensive information how to organize and run a magnetic observatory and make magnetic measurements. This Guide presents specifications and procedures recommended to determine magnetic secular variation by carrying out magnetic repeat station measurements. These procedures are much more stringent than those for vector ground-surveys. Permanent magnetic observatories provide the most accurate source of secular variation information, but the present network of magnetic observatories does not give adequate spatial coverage of the globe.
Repeat stations provide an important and cost-effective means of supplementing observatory data.
Repeat data have long been used for producing regional field models and charts. Appendices to the Guide include an equipment checklist, reporting forms and record sheets, and computer programs. Unique to IUGG, IAHS maintains a permanent office of publications, and prints a number of reports, journals and special volumes. Their most recent book illustrates the nature of these publications. This book presents a regional hydrological study of a very important river.