| #8381 | X-Ray Spectrometry. -- London : Heyden, 1972-. -- ISSN 0049-8246 print. -- ISSN 1097-4539 online |
| #8382 | X-ray technician. -- Spojené státy americké : Saint Paul : American Society of X-ray Technicians, 1929-1963 |
| #8383 | Xerox disclosure journal. -- Stamford : Xerox, 1976-. -- ISSN 0361-4190 |
| #8384 | Yearbook and List of Members - Institution of Engineers and Shipbuilders in Scotland. -- Velká Británie : London : Institution of Engineers and Shipbuilders in Scotland, 1900-1990 |
| #8385 | Yearbook and List of Members - Institution of Water Engineers. -- Velká Británie : London : Institution of Water Engineers, 1947-1955 |
| #8386 | Yearbook and list of members of the Institution of structural engineers. -- Velká Británie : London : Institution of Structural Engineers, 1950-1966 |
| #8387 | Yearbook of the American Iron and Steel Institute. -- Spojené státy americké : New York : American Iron and Steel Institute, [1912-1971, 1912-1971. -- ISSN 0096-4735 |
| #8388 | Yearbook of the heating and ventilating industry. -- Velká Británie : London : Technitrade Journals, [1947]-, 1947- |
| #8389 | Yearly proceedings - Association of Iron and Steel Engineers : Reprinted from Iron and steel engineer. -- Spojené státy americké : Pittsburgh : AISE, [1938-1994], 1938-1994 |
| #8390 | Yōgyō Kyōkaishi. -- Tokyo : Yōgyō Kyōkai, 1950-1987. -- ISSN 0009-0255 print. -- ISSN 1884-2127 online |