| Business | Phone |
| Advance Resource Technologies 9701 Philadelphia Ct # Q, Lanham 20706 | (301) 577-0818 |
| Rowman & Littlefield Pub Group 4501 Forbes Blvd # 200, Lanham 20706 | (301) 459-3366 |
| Trader Publishing Co 4200 Forbes Blvd, Lanham 20706 | (240) 260-2278 |
| Viatech Publishing 5200 Philadelphia Way, Lanham 20706 | (301) 306-6953 |