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Advent calendar on sustainable development 2009
25 case studies on sustainable development in practice - with daily quizzes and ideas for sustainable xmas gifts
willkommen
bienvenue
welcome
benvenuto
bienvenidos
23
12
7
20
17
13
9
22
1
21
16
19
14
24
3
4
15
18
8
10
2
6
5
11
25
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