| #271 | Proceedings of IREE. -- Australie : Sydney : Institution of Radio and Electronics Engineers Australia, 1972-1975. -- ISSN 0314-4313 |
| #272 | Proceedings of the annual convention - American Concrete Institute. -- Spojené státy americké : Detroit : American Concrete Institute, 1914-1929. -- ISSN 0272-4235 |
| #273 | Proceedings of the British Institution of Radio Engineers. -- Velká Británie : London : vl. n, 1963-1964 |
| #274 | Proceedings of the Institute of Radio Engineers. -- New York : Institute of Radio Engineers, 1913-1938. -- ISSN 0731-5996 print. -- ISSN 2162-6626 online |
| #275 | Proceedings of the Institution of Electrical Engineers, Part B, Electronic and communication engineering, including radio engineering. -- London : Institution of Electrical Engineers, 1955-1962. -- ISSN 0369-8890 print. -- ISSN 2054-0418 online |
| #276 | Proceedings of the Institution of Radio Engineers Australia. -- Australie : Sydney : Institution of Radio Engineers Australia, 1937-1963. -- ISSN 0314-4305 |
| #277 | Professional : čtvrtletník pro firemní zákazníky společnosti T-mobile. -- Praha : T-Mobile Czech Republic, 2005-2011 |
| #278 | PTT Revue. -- Česká Republika : Praha : Nakladatelství dopravy a spojů, 1970-1991. -- ISSN 0322-8207 |
| #279 | QST : devoted entirely to Amateur Radio. -- Newington : The American Radio Relay Leaque, 1915-. -- ISSN 0033-4812 |
| #280 | RadCom. -- Potters Bar : Radio Society of Great Britain, 1995-. -- ISSN 1367-1499 |