Geological Survey of Canada. The Effect of Changing Magnetic Declination on the Compass. 1991.
Merrill, R.T. and McIlhinny, M.W. The Earth's Magnetic Field. 1983.
Warlow, Peter. The Reversing Earth. London: Dent, 1982.
Fischman, Joshua. "Flipping the field." Discover. May, 1990.
Kappenman, John K. and Albertson, Vernon D. "Bracing for Geomagnetic Storms." IEEE Spectrum. March, 1990.
Newitt, L.R. and Dawson, Edward. "Kingston Harbour Magnetic Anomaly." The Canadian Surveyor. Vol. 34, No. 4, December, 1980.
Geomagnetic Data Group, National Geophysical Data Center. GEOMAG freeware.
Interpex Limited of Golden, Colorado. GEOMAGIX freeware version of the user interface for the USGS program GEOMAG, written by John M. Quinn of the USGS.
Naval Oceanographic Office, DOD Geomagnetic Data Library (N3422), Stennis Space Center, Mississippi. GEOMAGB (dmabasic.exe) freeware.
Silva 7NL (Polaris), Type 7. 1973.
Suunto MC-1.
Suunto Compass & Map Pocket Guide. 1996.
Reeves, Hubert. Introduction à l'Astronomie
Albuquerque Transmitter Hunters. Declination: don't take someone elses' word for it.
National (USA) Geophysical Data Center / WDC-A for Solid Earth Geophysics, Boulder, Colorado. The Geomagnetic Field.
National (USA) Geophysical Data Center / WDC-A for Solid Earth Geophysics, Boulder, Colorado. Frequently Asked Questions - The Geomagnetic Field.
Gobert, C. (claude.gobert at sk dot sympatico dot ca). "SPQ on the rise?" (use of anomalies in diamond mining.) alt.invest.penny-stocks 1997/02/13.
Hollow, John (hollow at brahma dot trl dot OZ dot AU). "Compass in Australia - extract of recent email" (Silva latitude zones.) rec.sport.orienteering, aus.bushwalking 1996/06/07.
Miller, John (jmiller at wdl dot lmco dot com). "Re: Question?" (magnetic inclination compensation.) rec.sport.orienteering 1996/09/26.
Arild Jensen (near Newmarket, Ontario) for e-mailing about an anomaly north of Kingston, Ontario.
Larry R. Newitt (newitt at geolab dot nrcan dot gc dot ca) at the Geological Survey of Canada for expert critiques and for snail-mailing me a copy of "Kingston Harbour Magnetic Anomaly."
Steve Tarry (member of Up North Orienteers, New Hampshire) for information about magnetic meridian maps.
John N. Wright (University of Texas, Austin) for e-mailing about the Grants, New Mexico anomaly.