This is the third volume by David Dobson to identify vessels that traveled from Ireland to North America before 1850 and were known to, or were likely to, carry passengers. Based on research in contemporary sources--particularly newspapers--on both sides of the Atlantic, this work identifies an additional 1,500 ships that were involved in transporting immigrants to the U.S. or Canada. For each vessel cited in this book, we learn the dates and ports of embarkation and arrival, the source of the information, and frequently the number of passengers and the name of the ship's captain. Readers will find a table of sources at the back of the volume.