Spatial Coverage
- Ohio River Valley1
- Orkney (Scotland)1
- Otranto (Italy)1
- Ottawa River Region (Quebec and Ont.)1
- Papua New Guinea1
- Peloponnesus (Greece)1
- Perugia (Italy : Province)1
- Pesaro e Urbino (Italy : Province)1
- Philippines1
- Piacenza (Italy)1
- Piedmont1
- Pisa (Italy : Province)1
- Pisa (Italy)1
- Pisa.1
- Poland1
- Pontremoli (Italy)1
- Prince Edward Island1
- Prussia (Germany)1
- Puerto Rico1
- Québec (Province)1
