Möglichkeiten der Herabsetzung des Wasserbedarfes in Gerbereien

Trades waste : its treatment and utilisation. : with special reference to the prevention of rivers pollution. : a handbook for borough engineers, surveyors, architects and analysts.

The new agriculture: The By-products of Animal Hide can be used in the Agricultural Cycle for the Development of Fertility to Optimize the Vegetative Cycle