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 | Talk is Free Theatre | Barrie |
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| Talk Suicide Canada | Toronto |
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 | Tarion Warranty Corporation, Ontario New Home Warranty Program | Toronto Downtown |
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 | Tecumseth and West Gwillimbury Historical Society | Newton Robinson |
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 | Telecare Distress Line of Greater Simcoe, Reassurance Call Program, Orillia | Orillia |
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 | Tetra Society of North America, Mailing Address, Northern Ontario Chapter | Oro-Medonte |
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 | The Blueberry Place | Tay |
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 | The common roof, Barrie | Barrie |
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| The Elden of Bradford | Bradford |
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 | The Good Latch | Barrie |
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 | The Kinder Garden Children's Centre for Excellence and Early Education | Essa |
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 | The Lighthouse, Orillia, Community Services | |
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 | The Lighthouse, Orillia, Emergency Shelter and Warming Centre | |
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 | The Well Community Chapel | New Tecumseth |
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 | Theatre by the Bay, Barrie Theatre Lab | Barrie |
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 | Theatre by the Bay | Barrie |
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 | Theatre Collingwood, March Break Drama Program | Collingwood |
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 | Thornton Community Food Bank | Essa |
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| Ticket Agencies | Barrie |
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 | Timothy Christian School | Barrie |
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 | TOPS, Alcona | Alcona |
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 | TOPS | Essa |
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| TOPS, Orillia | Orillia |
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| TOPS, Stayner | |
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 | TOPS. Barrie | Barrie |
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 | Tottenham and Area Holiday Hamper | New Tecumseth |
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 | Tottenham Co-Op Preschool | New Tecumseth |
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 | Tottenham United Church | New Tecumseth |
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 | Tourism Barrie | Barrie |
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 | Tourism Simcoe County, No Physical Address, Simcoe County Farm Fresh | Simcoe |
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 | Towards Recovery Clinic, Barrie, Towards Recovery Clinic, Barrie | Barrie |
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 | TransUnion of Canada, Burlington, Consumer Relations | Burlington |
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 | Trinity Anglican Church, Bradford | Bradford West Gwillimbury |
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 | Trinity United Church, Collingwood | Collingwood |
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 | Triple P Positive Parenting Program Network in Simcoe County and Muskoka | Barrie |
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 | Tuberous Sclerosis Canada Sclérose Tubéreuse | Barrie |
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 | TVO ILC | Toronto |