| Name | Count | Years active |
|---|---|---|
| Technical Press | 80 | 1930, 1949, 1952, 1957-1958, 1960, 1962, 1964-1973, 1975, 1977-1984, 1986-1987 |
| Ashgate | 56 | 1994-1995, 1997-1999, 2001 |
| Avebury Aviation | 43 | 1994-1997 |
| Gower Technical Press | 40 | 1900, 1987-1988 |
| Gower Technical | 36 | 1987-1990 |
| Gower Pub. Co. | 35 | 1986-1988 |
| Avebury Technical | 28 | 1993-1996 |
| Gower | 12 | 1987-1989, 1994 |
| Technical Press in association with Unicom Seminars Ltd. | 10 | 1986-1987 |
| Ashgate Pub. Co. | 10 | 1993-1995 |