01334cam 2200265za 45009.842129CaOODSP20221107152245cr |||||||||||170821q1988 onc ||||o f|0| 0 eng dCaOODSPengn-cn---M183-4/88-2E-PDFNewitt, L.R.Pier differences at Ottawa Magnetic Observatory [electronic resource] / L.R. Newitt.[Ottawa] : Geophysics Division, Geological Survey of Canada, [1988]9, [1] p.Internal report ;no. 88-2Digitized edition from print [produced by Natural Resources Canada]."In late 1987, new marble piers were installed in Ottawa absolute Building No 4 to replace piers B, C, D, and E which were made of concrete. After the installation of the piers, the GSM-18 proton magnetometer was used to determine differences in total intensity between piers. ..."--p. 2.gccstGeophysicsCanada. Energy, Mines and Resources Canada.Geological Survey of Canada.Geophysics Division.Internal report (Geological Survey of Canada. Geophysics Division)no. 88-2(CaOODSP)9.842124PDF1.33 MBhttps://publications.gc.ca/collections/collection_2017/rncan-nrcan/M183-4-88-2-eng.pdf