Question:
I am new to genealogy and I would like to know what the difference between a Great Migration database ancestor, and one that appears in the Pilgrim Migration both by Robert C. Anderson.
Answer:
If you have an ancestor who lived in Plymouth Colony between 1620 and 1633 they would be associated with both the Pilgrim Migration - Immigrants to Plymouth Colony 1620-1633 (NEHGS, 2004), and the Great Migration Database and published series. However if your ancestors were not Plymouth Colony residents, yet arrived in New England between 1620-1635 they would be part of the Great Migration series being published by NEHGS.