1. A portable water-tube tiltmeter;Eaton;Bull. Seism. Soc. Amer.,1959
2. Observations of changes in the inclination of the Earth's surface at Mt. Tsukuba;Hagiwara;Bull. Earthq. Res. Inst., Tokyo Univ.,1947
3. Observations of the deformation of the Earth's surface at Aburatsubo, Miura Peninsula;Hagiwara;Bull. Earthq. Res. Inst., Tokyo Univ.,1951
4. Tilt records for thirteen years at the Hawaiian Voleano Observatory;Jaggar;Bull. Seism. Soc. Am.,1929
5. U. S. Geol. Survey Bull.;Macdoanald,1957