Contents:

17 16 01 Structure of the biosphere (2F)
17 16 02 The population explosion (2F)
17 16 08 Sources of air pollution and measures for keeping the air clean (4F)
17 16 09* Processes in the atmosphere (4F)
17 16 15* Water cycle in the nature (3F)
17 16 16 Drinking water - sewage (winning, use and sewage) (4F)
17 16 18 Waste water treatment plant (3F)
17 21 71* Biological sewage treatment (1F)
17 16 25 The problems of refuse and refuse disposal (4F)
17 16 32 Pesticides in the food chain (2F)

Transparency folder with 10 transparencies with 29 foils, size: 21,5 x 28 cm, with subject-matter texts, in a special ring binder.
Price (without V.A.T.): 143,50 Euro