31 Episcopal conferences should take common counsel to deal with weightier questions and urgent problems, without however neglecting local differences. Lest the already insufficient supply of men and means be further dissipated, or lest projects be multiplied without necessity, it is recommended that they pool their resources to found projects which will serve the good of all as for instance, seminaries; technical schools and schools of higher learning; pastoral, catechetical, and liturgical centers; as well as the means of social communication. Such cooperation, when indicated, should also be initiated between several different episcopal conferences.
Source: Ad Gentes (Vatican.va)