- archive.org Texts
- ethw.org Geomagnetism_and_Edmond_Halley_(1656-…
- jstage.jst.go.jp browse/jgg1949
- reeve.com Documents/SAM/GeomagnetismTutorial.pdf
- http://unmannedspaceflight.com index.php…
- ntnuopen.ntnu.no ntnu-xmlui/bitstream/handle/…
- eoas.ubc.ca ~mjelline/453website/eosc453/E_prints…
- cambridge.org core/books/volcanism-and-global-…
- typeset.io papers/secular-geomagnetic-variations-…