Ripper, I. D.
Seismograph calibrations, Port Moresby Geophysical Observatory, TPNG, 1958-1962 by I. D. Ripper. - [Canberra ] Bureau of Mineral Resources, Geology and Geophysics [1966]. - [3], 4 leaves, 4 leaves of plates 33 cm. - Record 1966/185. .
On cover: Dept. of National Development.
Seismometers--Calibration.
Seismograph calibrations, Port Moresby Geophysical Observatory, TPNG, 1958-1962 by I. D. Ripper. - [Canberra ] Bureau of Mineral Resources, Geology and Geophysics [1966]. - [3], 4 leaves, 4 leaves of plates 33 cm. - Record 1966/185. .
On cover: Dept. of National Development.
Seismometers--Calibration.