The four ages: we've only just begun.
Bouchard
C S
CS
Aquinas Institute of Theology, St. Louis, USA.
D002410:Catholicism; D002977:Clergy; D003142:Communication; D006740:Hospital Administrators; D016519:Hospitals, Religious / Q000458:organization & administration*; D006801:Humans; D007857:Leadership; D010327:Pastoral Care / Q000193:education*; D013192:Staff Development; D014481:United States