Maine, Knox County, Probate Estate Files, 1861-1915 Description Estate files located in the Knox County Probate Record Office in Rockland, Maine. This collection is being published as images become available. How to Use this Collection » View Images in this Collection Browse through 58109 images Citing this Collection "Maine, Knox County, Probate Estate Files, 1861-1915." Images. FamilySearch. http://FamilySearch.org : 14 June 2016. Probate Record Office, Rockland.