I found a place where you can buy there publication:
The Demarest Family. David Des Marest of the French Patent on the Hackensack and his Descendants. Demarest, MaryA. (1938), 608 pages.Book $66.88, CD $30.40
The Demarest Family: A Record of the desMarets Family in France, the Holy Land in the Crusades, Again in France, Holland, the Palatinate (Germany), Again in Holland, and the Migration to America, 1663. 2 vols. Demarest, Voorhis D. 1964, 1328 pages, Book $119.52, CD $66.40.