Publications Publications & References These searchable source materials offer important information concerning the Natural Heritage Program. NHP Publications Search a list of publications, view a regional and county inventory map, and get rare plant and animal lists. Field Biology References Useful books and websites that help identify species and natural communities in North Carolina. Status Codes and Terms A PDF document detailing terminology dealing with elements of natural diversity. Exploring Our Natural Treasures The research conducted by the Natural Heritage Program biologists helps to provide a better understanding of North Carolina's natural areas. Sample their published work, as well as lists of rare animals and plants. The rare species lists are organized by region and periodically updated, usually at around two year intervals. We also document the elements used to classify Natural Communities in our state.