RESEARCH STUDIES
We were able to obtain all
the informations we needed about the extractive activity in Umbria thanks to the following
sources:
Department of The Defence
of the soil in Umbria for the proposition of the P.R.A.E.
Regional Institute for
economics and social researches according to date from the census up to 1976.
We also consulted the
report about the surroundings health in Umbria published by the IRRES, our school books of
lithology, the testimony of the experts, our educational visits to the quarries and to the
cement factories belonging to Barbetti Brothers near Gubbio.
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