Ripper, I. D. <br/><br/>
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. .
<br/><br/> On cover: Dept. of National Development. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Seismometers--Calibration.