Ejemplos de uso de PTN
1. Jonathan Tyler is an independent railway consultant specialising in strategic timetable research and planning. ptn@btconnect.com If you wish to respond, at greater length than in a letter, to an article in which you have featured either directly or indirectly, email response@guardian.co.uk or write to Response, The Guardian, 11' Farringdon Road, London EC1R 3ER.