Collection includes rock cores extracted during drilling operations by Northern Joint Venture for mineral exploration in northern Maine. Drilling operations occured in townships: T7R14, T7R15, T8R10, T8R11, T9R8, T9R9, T9R10, T10R8, T10R9, T10R10, T11R7, T11R9. Please contact the Maine Geological Survey to discuss access to the collection.