Canton de Genève (1) Suisse (1) Observations (1) Observations (1) Nineteen sixties (1) Nineteen fifties (1) Restrooms (1) Worms (1) Turnover (Business) (1) Toilets (1) Runoff (1) Rivers (1) Production (Economic theory) (1) Plankton (1) Phytoplankton (1) Phosphorus (1) Phosphates (1) Necessity (Philosophy) (1) Lakes (1) Evidence (1) Eutrophication (1) Climatology (1) Climate (1) Cleaning compounds (1) Average (1) Body area networks (Electronics) (1) Sources (1) Sources (1) Measurement (1) Influence (1)