00584nam a2200169Ia 4500003000900000008004100009040001600050080001500066100002700081245010100108260003500209300001600244650004100260942000700301999001500308952009100323IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a550.3bBRU  aBruckshaw, J McG92917 0aMagnetic variometers of the schmidt typebtheir full use and maintenancecJohn McGarva Bruckshaw  aLondonbHilger and Wattsc1954  aviii, 115p.  aAstronomy and Astrophysics Thesaurus  cBK  c1426d1426  00104070aBANbKODcGENd0000-00-00l0o550.3/ BRUp1506r2021-11-05w0000-00-00yBK