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Challenges : science and peace in a rapidly changing environment ; proceedings
Rilling, Rainer (ed.); Spitzer, Hartwig (contributor);  … - 1992
Persistent link: https://www.econbiz.de/10000853155
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Challenges ; 1
Rilling, Rainer (ed.); Spitzer, Hartwig (ed.);  … - 1992
Persistent link: https://www.econbiz.de/10000853156
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Challenges ; 2
Rilling, Rainer (ed.); Spitzer, Hartwig (ed.);  … - 1992
Persistent link: https://www.econbiz.de/10000853157
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Regionale Landwirtschaft : die Entwicklungsaufgaben der "Region" für Landwirtschaft und Raumordnung
Spitzer, Hartwig - 1975
Persistent link: https://www.econbiz.de/10004696471