This work is a very helpful aid in the use of the indexes of immigrant passenger lists in the National Archives, for they are arranged in the chronological order of the ships' arrival dates, and thereunder by the names of the vessels or the passenger lines, and only then by passengers' surnames. This directory provides a ready means of ascertaining information that will be helpful, for it is arranged by year and steamship company, and thereunder by port of entry, the vessel name, its arrival date and port of embarkation.