This series of 'Mayflower Families Through Five Generations' aka "the silver books' are virtually the 'gold standard' and often the only good source of information about the lives of many Mayflower passengers. As someone who has researched almost all Mayflower passengers in depth and written many Wikipedia articles about them, this series was extremely valuable. A case in point is one of my 3 Mayflower ancestors, William White, who has much information out on the internet from sources long ago discredited by the Mayflower Society, with his 'silver book' being the only acceptable source as far as the Society is concerned. In researching Mayflower passengers in Wikitree, I am often surprised about the great number of Mayflower passengers and their family members who could, but do not have cited, a 'silver book' as a source of information.