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LAND+SYSTEM GmbH, Bremen, Technoloy of Geographical Information Systems
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
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University of Dortmund, spatial planning department
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HP environmental planning, scientific services
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EKO-Konsult, Danzig
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Points publishing company, points-Geo-Informationsystems, Norden (Germany) and Halmstad (Sweden)
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Planning society for energy and environment, Oldenburg
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Society for environmental impact assessments
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Regional planning association Oberlausitz-Niederschlesien
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