1 Subjects: “...national ambient air quality standards...”

2 Subjects: “... National liberation and independence...”

3 “... national economies and the crisis-stricken world economy and thus stabilize capitalism. Together...”

4 “..., embracing diverse cultural and economic backgrounds. Today, the United Nations articulates the 17...”

5 “... is of great importance for the optimization of national space. The book mainly focuses on functional...”

6 “.../regional/national/social level. A wide range of subjects linking the applied natural sciences...”