Moravek Endre: Index acronymorum selectorum. Pars 7. Instituta communicationis (A MTAK kiadványai 47. Budapest, 1966)
- 125 P. M.P, Paris and Mont Pleasant Railroad Company, /US/ /е/ PMRR Pere Marquette Railroad Company /е/ PMSS Pacific Mail Steamship Company, /GB/ /е/ PNA Pacific Northern Airlines, Inc. /е/ PNI) Presse-Nachrichtendienst, Wi /d/ PNF Penn Traffic Company, /US/ /е/ PNJ Pressedienst der Nationalen Jugend, /BRD/ /d/ PNS 1. Philippine News Service, Manila /е/ 2. Poštovní Novinová Slušba /Č/ P.N.T. Patronato Nacional del Turismo /es/ PNÉ Poštovní Novinový lÎKad /<У/ PNYA Port of New York Authority /е/ PO 1. Paris-Orleans /chenim de fer/ /е/ 2. Post Office, /GB/ /е/ P.O. A.L. Pacific Overseas Air Lines, /US/ /е/ POAS Pacific Overseas Airlines /Siam/ Ltd, Bangkok /е/ РОВ Post Office Board /е/ POD Post Office Department, W /е/ POFIS Poštovní Filatelistická Slušba /<У/ Polocean Polskié Linje Oceaniczne /ро/ POSTAL Director of Postal Services /е/ Post Sec postal section /е/ PO Tel Post Office Telephone /е/ Po Wi Politik- und Wirtschaft-Pressedienst /d/ PÖS Pressedienst des Österreichischen Sängerbundes /d/ PP Parcel Post, /US/ /е/ PPA 1« Pakistan Press Association, Karachi /е/ 2. Parcel Post Association /,US/ /е/ 3. Parteifreier Pressedienst Austria /d/ PPP Parlamentarisch-Politischer Pressedienst, Bonn /d/ PPP, Agence Agence Presse, Propagande, Publicité Société Anonyme ,Ls/f/ PPRB Press and Public Relations Branch, /US/ /е/ PPS Petroleum Press Service, /GB/ /е/ PPTiT Poczta Polska, Telegraf i Telefon /ро/ PPT Orbis Przedsiçbiorstwo Podróžy i Turystyki Orbis /ро/ PP. ТТ. Poste e Telecomunicazioni /i/ PPŽM Polskié Przedsiçbiorstwo Žeglugi Morskiej /ро/
