If your ancestors lived in Southeastern Massachusetts (the Counties of Bristol, Plymouth, Barnstable, Dukes, Nantucket, Norfolk or Suffolk), you may find this free resource extremely valuable! "Representative men and old families of southeastern Massachusetts, containing historical sketches of prominent and representative citizens and genealogical records of many of the old families", was published in 1912 in three volumes. You can easily and freely access each volume using the links below.
Among these pages, you may find detailed genealogies, biographies and possibly even a portrait of relatives or ancestors in your family. Tip: Don't just rely on the index. Use the page's search feature to search too.