| COCKRILL (P) | Ocean Mails; being an account of sea & ship cancellations of the 20th century | Maritime |
| COCKRILL (P) | United Fruit Company; the hsitory, ships & cancellations of the Great White Fleet [1982] | Maritime |
| COCKRILL (P) | United States sea post cancellations [1988[ | Maritime |
| COCKRILL (P) | German “Seepost” cancellations 1886-1939 – Part 1 The European, North & South Atlantic routes | N/A |
| COCKRILL (Philip) | The history, ships & postal cancellations of the Woermann Line [1980] | Maritime |
| COCKRILL (Philip) | K.N.S.M. The Royal Netherlands Steamship Company (1856-1981) [1981] | Maritime, Netherlands |
| COCKRILL (Philip) | German ‘seepost’ cancellations 1886-1939; Part 1 – The European, North & South Atlantic routes; Part 2 – The African, Asian & Australation routes [1986] | Maritime |
| COCKRILL (Philip) | K.P.M. Koninklijke Paketvaart Maatschappij (1891-1941) with Java – China – Japan – Line to 1970 [1982] | Maritime |
| COCKRILL (Philip) | Cross-Channel & North Sea shipping services Pt 2 | N/A |
| COCKRILL (Philip) | The Cross-Channel services Pt 1 | N/A |
| COCKRILL (Philip) | Egypt: the Posta Europea and the 1984 Kehr catalogue of interpostals [1864-1802] + suppt | N/A |
| COCKRILL (Philip) | Newfoundland: travelling post office cancellations | N/A |
| COCKRILL (Philip) | Netherlands & colonies: maritime markings & ship cancellations (1793-1939) | Colonies, Maritime, Netherlands |
| CODLING (Alan N) | The Travelling Post Offices (Ambulancias) of Chile [2010] | Railways |
| COHEN (Stanley F), | Collecting British squared circle postmarks (2nd edition) Part 1 – The Provincial Offices; Part 2 – The London Offices | N/A |
| COHN (E M) | Unusual mail in Occupied France 1870-71 | N/A |
| COHN (Ernst M) | A book of postal history [1988] | N/A |
| COHN (Ernst M) | Ordinary mail by diplomatic means during the Siege of Paris [1995] | N/A |
| COHN (Ernst M) | The other homing pigeons of 1870: a highly fragmented story [1976] | N/A |
| COHN (Ernst M) | Die ‘papillons’ von Metz oder die beiden ballon posten van Metz [1976] | N/A |
| COLEMAN (H A) | U.S. army post offices overseas (2nd edition) | Military |
| COLES (John H) | Postal cancellations of the Ottoman Empire.[1984 & 1987] Part 1 – Lost territories in Europe; Part 2 – Lost territories in Africa & Europe; Part 3 – Turkey in Europe | N/A |
| COLLEY (Bill) | East African airmails to 1939 | Aviation |
| COLLEY (Bill) | Locally printed forces airmail, lettercards of East Africa in world war II | Local, WW2 |
| COLLEY (N M) | Censorship in the Royal Air Force 1918 to 1956 | Aviation |
| COLLINS (Norman J) | Overland mail via the Syro-Iraqi Great Desert…with Zvi Alexander and Norman Gladstone | N/A |
| COLLINS (Norman J) | The Ottoman post and telegraph offices in Palestine and Sinai; translations by Ernest C Sterne | N/A |
| COLLINS (Peter) | The Afghan Campaign 1841-43. The letters of Captain William Riddell | Military |
| COLLIS (Dave) | Mashonaland a postal history 1890-96 | N/A |
| COLLOT (G), CORNU (A) | French African Airmails 1932 to 1940 trans. Parmenter (J) [2013] | Aviation |
| COLONIAL POSTAGE | The rates of postage charged upon letters between…the East Indies…India…Cape of Good Hope, | Maritime |
| comite national de propagande aeronautiq | Les Liaisons aeriennes entre la Belgique et le Congo Belge [1955] | Aviation, Belgium, Colonies |
| CONNELL (G W) | The Finnish shipping companies and their stamps | Maritime |
| CONSTANTINE (Ole) | Sealed under permit marks: a simplified listing of known UK permit marks 2nd ed | N/A |
| CONSTANTINIDES (A C) | History of the City of London Philatelic Society [1912] | N/A |
| COOPER (Jal) | Early Indian cancellations | N/A |
| COOPER (Jal) | India used abroad | N/A |
| COOPER (Jal) | India used in Burma | N/A |
| COOPER (Jal) | Stamps of India | N/A |
| COPELAND (John) | Roads & their traffic 1750-1850 | Coaching |
| COPELAND (Peter) | Gloucester’s postal history | N/A |
| COPPENS (Maarten) | La Poste a Anvers depuis ses debuts jusqu’en 1793 | N/A |
| CORBY (Michael E) | The postal business 1969-79: a study in public sector management | N/A |
| CORNELIUS (David B) | Devon & Cornwall: a postal survey 1500-1791. Devon & Cornwall: a postal survey 1500-1791 | N/A |
| CORNELIUS (David B) | An introduction to the postal history of Denmark 1624-1950 | Scandinavia |
| Correios e Telecomunicacoes de Portugal | O correio em Portugal – algumas datas [1976] | N/A |
| COSTA (W S da) | Binnenlandse en internationale posttarieven van Nederland 1850-1990 | N/A |
| COURTIS (J K) | Analysis of Worldwide Postal Wrappers, Vols 1 & 2 [2021] | Stationery |
| COURTNEY (James) | A postal history of Darlington | N/A |
| COUTSIS (J C) | The Greek post offices & their postmarks from 1861 to 1900 | N/A |
