In answer to your question about any currently written Books written on the Hillegas surname/family the following is a message I recieved from the author Russell K. Hillegass, Jr. on 24 jan. 2003."My research has centered around three basic spellings, i.e. Hillegas, Hillegass & Hilligoss.I have come across quite a few alternate spellings such as Hilligas, Hillengass, Hillicoss, etc.I'm not sure how some of these spellings came about.I have been researching the Hillegass line for over 15 years.The two main spellings are Hillegass/Hillegas and Hilligoss.Most of these lead back to one family in Sinsheim, Baden Germany, namely Hans Peter Hillegass (1649-1719) married to Anna Regina Triegel (1655-1708).Three of their sons emigrated to America in the early 1700's.One of them, George Michael, was the father of Michael Hillegas, first Treasurer of the United States.I recently published my research in three volumes and over 3050 pages entitle "A Genealogy of the Hillegass/Hilligoss Family in America".I have place it in several libraries.As I indicated before I hve not been able to tie [your]the Hilligas branch in to the main line that I have researched.The furtherest I can back on that line is Otis who was born circa 1830." "Thanks for you inquiry. Russell K. Hillegass, Jr."