| Business | Phone |
| Washington Publishing Co 13309 Vandalia Dr, Rockville 20853 | (301) 949-9740 |
| Biotechnology Information Inst 1103 Crawford Dr, Rockville 20851 | (301) 424-0255 |
| Selective House Publishers Inc 16309 Grande Vista Dr, Rockville 20855 | (301) 990-2999 |
| Raven Publications 1803 Research Blvd, Rockville 20850 | (301) 738-8103 |
| Farrco Rockville 20850 | (301) 309-1010 |
| Mulberry Technologies Inc 17 W Jefferson St # 207, Rockville 20850 | (301) 315-9631 |
| Garmat Associates 15200 Shady Grove Rd # 350, Rockville 20850 | (301) 296-4443 |
| Garrett Communications Inc 932 Hungerford Dr # 29b, Rockville 20850 | (301) 738-7927 |
| Middle East Bazaar Inc 1010 Rockville Pike # 606, Rockville 20852 | (301) 309-9000 |
| Hart Publications 6011 Executive Blvd # 200, Rockville 20852 | (301) 468-1039 |
| Image Library 4809 Tallahassee Ave, Rockville 20853 | (301) 933-1636 |
| Information Usa 12079 Nebel St, Rockville 20852 | (301) 924-0556 |
| Jeffren Publishing Co 1513 Auburn Ave, Rockville 20850 | (301) 279-7082 |
| Kabel Publishers 11225 Huntover Dr, Rockville 20852 | (301) 468-6463 |