Pre-FIRM : Construction or substantial improvement that started on or before December 31, 1974, or before the effective date of the initial Flood Insurance Rate Map (FIRM) of the community, whichever is later
W. Louis Sidell, Jr., CFM, State Coordinator, Brigitte Ndikum-Nyada, Maine Floodplain Management Handbook, Appendix O, Glossary, Planner, State Planning Office, Maine, USA 2007. http://www.maine.gov/doc/commissioner/flood/docs/h andbook07/28-dix%20O-glossary.pdf, (ND/ Flood - Amer) {507}
