| POST OFFICE | List of index numbers used in surcharge, explanatory & other stamps in Great Britain & Northern Ireland [1919] | N/A |
| POST OFFICE | Air Mail [1936] | Aviation |
| POST OFFICE | A Collection of the Statutes relating to the Post Office [1793] | N/A |
| POST OFFICE VEHICLE CLUB | Royal Mail trucks in Britain [1995] | N/A |
| POSTAL HISTORY SOCIETY | Ralph Allen & John Palmer: men of Bath [1953] | N/A |
| POSTAL HISTORY SOCIETY | A Display to The Royal Philatelic Society, London [1960, 1965, 2000] | N/A |
| POSTMUSEUM | Svenska frimarket 150 ar : the Swedish stamp 150 years [2005] | Scandinavia |
| POTHION (Jean) | Catalogue des marques postales lineaires France 1792-1832, et des marques manuscrites des distributions [1987] | France |
| POTHION (Jean) | Catalogue des cachets courrier-convoyeurs stations de France [1988] | France, Railways |
| POTHION (Jean) | l’Obliteration francaise [1976] | France |
| POTHION (Jean) | Nomenclature des bureaux de postes francais 1852-1876; petit et gros chiffres cotes [1979] | France |
| POTHION (Jean) | Marques postales et obliterations, bureaux francais a l’etranger 1561-1948, bureau de distribution d’Algerien de type 22 au type 84FB [1982] | Colonies, France |
| POTHION (Jean) | Histoire de la poste des origines a 1703: catalogue [1983] | France |
| POTHION (Jean) | France obliterations (sans Paris) 1849-1876 [1985] | France |
| POTHION (Jean) | France obliterations 1849-1876 [1975] | France |
| POTHION (Jean) | Dictionnaire des bureaux de poste francais 1575-1914 Vol. 1 – 1575-1904; Vol. 2 – 1904-1914 [1976-77] | France |
| POTHION (Jean) | Catalogue des marques postales des bureaux de distribution de France ‘Cursives’ 1819-1858 [1983] | France |
| POTHION (Jean) | Catalogue des cachets: petits chiffres des gros chiffres[1980] | France |
| POTHION (Jean) | Catalogue des cachets: facteurs boitiers type 1884 [1981] | France |
| POTHION (Jean) | Catalogue des cachets; courriers-convoyeurs-lignes 1877-1966 [1979] | France, Railways |
| POTHION (Jean) | Catalogue bureaux ambulants 1845-1965; cachets de gares 1854-1960 [1986] | France, Railways |
| POTHION (Vincent) | Catalogue des obliterations temporaires de France (non illustrees) 1855-1961 [1972] | France |
| POTTER (Ian A) | The Postal Markings of Jamaica [1996] | N/A |
| POWELL (P W W) | Confederate States of America – Markings & Postal History of Richmond, Virginia [1987] | United States |
| PRATS (Jesus Sitja) | Prefilatelia Colonial del Virreinato del Peru [2006] | N/A |
| PRATT (Richard W) | The Postal History of British Aden (1839-1967) [1985] | N/A |
| PRATT (Richard W) | Imperial China: history of the post [to] 1897 Vol 2 | N/A |
| PRATT (Richard W) | Imperial China: history of the post to 1896 Vol 1 & 2 [1994, 1998] | N/A |
| PRATT (Richard W) | Aden: its states & post offices 1840-1954 [1973] | N/A |
| PRATT'S | PRATT’S National Business Directory: showing the name & location of all the post towns, post offices,and postmasters in the USA [1850] | N/A |
| PRENZLAU-ENANDER (Gabriele), | The mail road across land and sea Stockholm-Aland-Turku/Abo: a historical travel guide through three regions [2004] | Scandinavia |
| PRESGRAVE (A,D,) | The Travelling Post Office of South Australia [1997] | Railways |
| PREVIATO (Luciano) | Prigionieri italiani in Gran Bretagna (1940-1947), realizzione grafica di Gianfranco Pastormerlo [2000] | Military |
| PREVIATO (Luciano) | Le legioni Polacche in Italia 1797-1806 [1980] | Military, Napoleon |
| PREVIATO (Luciano) | I bolli di Franchigia militare dalla Republica Cisalpina al regno d’Italia 1796-1814 [1982] | Napoleon |
| PRICE (George) | Pressganged:letters of a butcher pressganged from an East Indiaman 1803 [1994] | Maritime |
| PRIGARA (Sergej Vassil'evich) | The Russian post in the Empire, Turkey, China and the post in the Kingdom of Poland: [1981] | Russia |
| PRIME (Peter) | British Army Postal Cancellations of the Anglo-Boer War 1899 – 1902 [2003] | Military |
| PROUD (E) | Intercontinental Airmails: Vol. 1 Transatlantic & Pacific [2015], Vol. 2 Asia & Australasia [2009], Vol. 3 Africa [2010] | Aviation |
| PROUD (EB) | History of the South African Army Postal Service [1989] | Military |
| PROUD (EB) | History of the Naval and RAF Postal Services [1992] | Aviation, Maritime |
| PROUD (EB) | History of the Australian Military Postal Service 1914-1950 [1991] | Military, WW1, WW2 |
| PROUD (EB) | The Postal History of Uganda & Zanzibar [1993] | N/A |
| PROUD (EB) | The Postal History of Trinidad & Tobago | N/A |
| PROUD (EB) | The Postal History of Tanganyika 1915-1961 [1989] | N/A |
| PROUD (EB) | The Postal History of Swaziland & Zululand [1996] | N/A |
| PROUD (EB) | The Postal History of Sudan [2006] | N/A |
| PROUD (EB) | The Postal History of Southern Rhodesia | N/A |
| PROUD (EB) | The Postal History of Sierra Leone [1994] | N/A |
| PROUD (EB) | The Postal History of St Lucia & St Vincent [2006] | N/A |
