Report of the fourth session of the joint committee on forest working techniques and training of forest workers - Prague, Czechoslovakia, 19-24 Jun 1961.

ciencias forestales education ensayo equipo forestal extension extension activities forest management foresterie forestry forestry equipment formation mechanization methode methods occupational hazards riesgos ocupacionales risque professionnel safety seguridad testage testing tracteur tractores tractors training transport transporte vulgarisation