| Company | Category | Area | Address | Web | E-mail | Contact person |
| HISTORIC TAKOMA INC | Historical Research | Maryland | 419 ELM AVE, TAKOMA PARK, Montgomery, Maryland, 20912-5435, USA |
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| HISTORICAL CONSULTNG | Business Consulting Services | Maryland | 316 SUFFOLK RD, BALTIMORE, Baltimore (City), Maryland, 21218-2521, USA |
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Owen Hannaway |
| HISTORICAL ELECTRONICS MUSEUM | Museums | Maryland | 1745 W NURSERY RD, LINTHICUM HTS, Anne Arundel, Maryland, 21090-2906, USA |
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Kate Marks |
| HISTORICAL REPRODUCTIONS | Art Galleries & Dealers | Maryland | 14111 PENNSYLVANIA AVE, HAGERSTOWN, Washington, Maryland, 21742-2346, USA |
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Gene Albert |
| HISTORICAL SOC OF HARFORD CNTY | Museum/art Gallery | Maryland | PO BOX 366, BEL AIR, Harford, Maryland, 21014-0366, USA |
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Rick Herbig |
| HISTORICAL SOC OF KENT CNTY | Membership Organization | Maryland | PO BOX 665, CHESTERTOWN, Kent, Maryland, 21620-0665, USA |
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Kate Odonnell |
| HISTORICAL SOCIETY CECIL CNTY | Museum/art Gallery | Maryland | 135 E MAIN ST, ELKTON, Cecil, Maryland, 21921-5932, USA |
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Paula Newton |
| HISTORICAL SOCIETY OF CARROLL | Special Interest Libraries | Maryland | 210 E MAIN ST, WESTMINSTER, Carroll, Maryland, 21157-5225, USA |
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Barbara Lilly |
| HISTORICAL SOCIETY OF HARFORD | Organizations | Maryland | 143 N MAIN ST, BEL AIR, Harford, Maryland, 21014-3539, USA |
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Maryanna Skrowknski |
| HISTORICAL SOCIETY QUEEN ANNE | Historical Places | Maryland | 124 S COMMERCE ST, CENTREVILLE, Queen Annes, Maryland, 21617-1116, USA |
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