I added a link to the online version of the Trowbridge book (text only, which is more useful for searching and citing references), however there is a PDF version of the book available in the same area. Since it was published before 1920, it's in the public domain. Funny, they made it sound like it was all original research during the show, like they were making new discoveries, however looking at the citations online, all of the information presented was researched many years ago. That's typical for early immigrant families with lots of descendants, many of them prominent. Also typical for families that have lived in the midwest for a long period of time (the earlier pioneers, like Cindy Crawford's family) is that they came from early Colonial lines. They found the relationship for Cindy very quickly because of her (very distant) relationship to Ernest Hemingway. I'm very glad they focused on much older ancestors this time, that many more people are related to, with a good bit of historical context (Great Puritan Migration, and the English Civil War) thrown in.
I should try to connect Hemingway and Cindy to the Trowbridge family in WikiTree. I caught a little bit of the tree during the show, it looks like Cindy is descended from son James Trowbridge and grandson Thomas Trowbridge, and then through the Gates family. I'm descended through son James and grandson William, through the Winchester/Dana family. I can probably fill in the blanks pretty quickly.