http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
v. 1. Signal characteristics and instrument specifications, by N. A. Anstey.--v. 2. Instrument performance and testing, by B. S. Evenden and D. R. Stone.
By B. S. Evenden, D. R. Stone and N. A. Anstey.
Bibliography: volume 1, pages [150]-152.
Geoexploration monographs. Series 1 ; no. 3