Titlebook: ?kologische Landwirtschaft; Pflanzenbau — Tierha Immo Lünzer,Hartmut Vogtmann (Pr?sident) Book 1997 Springer-Verlag Berlin Heidelberg 1997

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0081-3869 nto space is an undertaking at the borderline of what is curreiitly feasible. h veq complex assen~bly of sophist~icated machinery is needed in order to reach orbit and return from there to Eart,ll safely. A11 ast,ronaut knows that only if t,he rocket engines, inertial navigat,ion platforms. hydrauli