d'AbbadieA. (1890). “Reconnaissances magnetiques”, Annales du Bureau des longitudes, iv, B'.1–B'.62.
2.
BauerL. A. (1895). Beiträge zur Kentness des Wesens der Säkular-Variation des Erdmagnetismus (Berlin).
3.
van BemmelenW. (1893). De isogonen in de XVIde en XVIIde eeuw (Utrecht).
4.
van BemmelenW. (1899). Die Abweichung der Magnetnadel; Beobachtungen, Säkular-Variation, Wet- und Isogonensystem bis Zur mitte des XVIIIten Jahrhunderts: Supplement to Observations made at the Royal Magnetical and Meteorological Observatory at Batavia, xxi, 1–106.
5.
BockR. and SchumannW. (1948). Katalog der Jahresmittel der magnetischen Elemente der Observatorien und der Stationen (Berlin: Akademie-Verlag).
6.
CavalloT. (1787). A treatise on magnetism, in theory and practice, with original experiments (London).
7.
ChurchmanJ. (1794). The magnetic atlas, or variation charts of the whole terraqueous globe; comprising a system of the variation and dip of the needle, by which, the observations being truly made, the longitude may be ascertained (London).
8.
FelgentraegerW. (1892). Die Längst Nachweisbare Periode der Erdmagnetischen Elementen (Göttingen).
9.
Gaibar-PuertasC. (1953). Variacion secular del campe geomagnetico (Tarragona: Observatorio del Ebro Memoria, no. 11).
10.
GellibrandH. (1635). A discourse mathematical on the variation of the magnetic needle (London).
11.
HansteenC. (1819). Untersuchungen über den Magnetismus der Erde (Christiania).
12.
HansteenC. (1855). Den magnetiske inclinations forandring i den nordlige temperate zone (Copenhagen).
13.
HansteenC. (1857). Den magnetiske Inclinations Forandringer (Copenhagen).
14.
LewisA. G. (1981). “Annual Mean Values of Geomagnetic Elements”, Geomagnetic bulletin of the Institute of Geological Sciences, x, 1–296.
15.
MalinS. R. C. and BullardE. C. (1981). “The direction of the Earth's magnetic field at London 1570–1975”, Philosophical transactions of the Royal Society, Accic, 357–423.
16.
MascartE. (1900). Traité de Magnétisme Terrestre (Paris).
17.
RaulinV. (1897). “Quelques vues générales sur les variations séculaires de magnétisme terrestre”, Actes de la Société Linnéenne de Bordeaux, xxvi, 1–92.
18.
SabineE. (1843). “Contributions to terrestrial magnetism no. IV”, Philosophical transactions of the Royal Society, cxxxiii, 113–43.
19.
SabineE. (1843). “Contributions to terrestrial magnetism no. V”, Philosophical transactions of the Royal Society, cxxxiii, 145–231.
20.
SabineE. (1844). “Contributions to terrestrial magnetism no. VI”, Philosophical transactions of the Royal Society, cxxxiv, 87–224.
21.
SabineE. (1862). “Report on the repetition of magnetic survey of England made at the request of the General Committee of the British Association”, Report of the British Association for the Advancement of Science for 1861, 250–79.
22.
SabineE. (1872). “Contributions to terrestrial magnetism no. XIII”, Philosophical transactions of the Royal Society, clxii, 353–433.
23.
SabineE. (1875). “Contributions to terrestrial magnetism no. XIV”, Philosophical transactions of the Royal Society, clxv, 161–203.
24.
SabineE. (1877). “Contributions to terrestrial magnetism no. XV”, Philosophical transactions of the Royal Society, clxvii, 461–508.
25.
VeinbergB. P. and ShibaevV. P. (1969). Catalogue, “the results of magnetic determinations at the equidistant points and epochs”, 1500–1940 (Moscow).
26.
WalkerE. (1866). Terrestrial and cosmical magnetism (Cambridge).
27.
WalkerR. (1794). A treatise on magnetism (London).
28.
WeyerG. D. E. (1895). “Die Magnetische Declination ihre säkulare veranderung fur 48 Beobachtung sorter”, Nova acta Academiae Caesareae Leopoldino Carolinae germanicae naturae curiosorum, lxiii, 313–97.