00404nam a22001217a 4500007000400000008000400004020001300008040000900021050001800030245018500048260003700233300001200270000000  a03402797  aUOEL  aHC103.7b.N37  aNatural Resources and Development :bA Biannual Collection of Recent German  Contributions Concerning the Exploration of Natural Resources /cEdited by the Scientific Co-operation.  aGermany :bGeorg Hauser,cc1990.  a96 p. :