Lilienthal published a book "Jüdische Wanderungen in Frankfurt am Main, Hessen, Hessen-Nassau"

The book published in 1938 prior to his move to the Netherlands is organized by town and describes various hikes in Hessen.  He included descriptions of the Jewish communities in the many small villages of the area (and Frankfurt) including facts about the community such as number of families, year it was established, etc.