XX General AssemblyXX General Assembly IUGG Vienna, 11-24 August 1991   program 

 - Vienna  International Association of Geomagnetism and Aeronomy  1991 
 - 502p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Solar PhysicsPlanetary Physics
<br/><br/><label>Universal Decimal Class. No.: </label>550.3(061/069)  / IUGG