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 | T. B. Radio Communications | Burlington |
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 | Tai Chi Healthy Bodies Healthy Minds | Milton |
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 | Take Off Pounds Sensibly, Georgetown Chapter, Weight Related Support Group | Georgetown |
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 | Take Off Pounds Sensibly, Acton Chapter, Weight Related Support Group | Acton |
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 | Take Off Pounds Sensibly, Burlington Chapter, Weight Related Support Group | Burlington |
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 | Take Off Pounds Sensibly, Milton Chapter, Weight Related Support Group | Milton |
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 | Talk Suicide Canada | Toronto |
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 | Talk4Healing, Telephone and On-line Chat Services, Telephone Helpline and On-line Chat Counselling Services | Thunder Bay |
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 | Talking for Change, CAMH Toronto Mail Address | Ontario |
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 | TechPlace | Burlington |
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 | Teen Legal Helpline | Toronto |
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 | TELUS Health MyCare | Toronto Downtown Central |
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 | Ten Oaks Project | Ottawa |
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 | The Halton Resource Connection, Child Care Directory and Information Line | Milton |
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 | The Halton Resource Connection, Resource Library | Milton |
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 | Theatre Burlington | Burlington |
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 | Thomas Alton Medical Clinic, Walk-in Medical Clinic | Burlington |
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 | Thompson Square Medical Centre | Milton |
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 | Thompson Walk-In and Medical Clinic | Milton |
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| Threads of Life - Association for Workplace Tragedy Family Support | London |
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 | Threshold School of Building, Ready to Work | Hamilton |
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 | Thrive Counselling, Burlington Head Office | Burlington |
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 | Thrive Counselling, Individual, Couple, and Family Counselling | Burlington |
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 | Thrive Counselling, Milton Office | Milton |
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 | Thrive Counselling, North Halton Office | Georgetown |
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 | Thrive Counselling, Oakville Office | Oakville |
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 | Thrive Counselling, Partner Assault Response Program | Burlington |
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 | Thrive Counselling, The Safety Zone Program | Halton Region |
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 | Thrive Counselling, Violence Against Women Program | Halton Region |
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 | Toronto Pflag, Toronto | Toronto |
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 | Total Care Transport Services | Milton |
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 | Tottering Biped Theatre | Burlington |
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 | Tourette Canada, Hamilton, Halton and Niagara Region Chapter | Burlington |
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 | Trans Lifeline | USA |
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 | Trillium Health Partners, Credit Valley Hospital, Genetics Program | Mississauga |
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 | Trillium Health Partners, Credit Valley Emergency Department, Credit Valley Hospital | Mississauga |
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 | Trillium Health Partners, Credit Valley Hospital | Mississauga |
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 | Trillium Photographic Club | Burlington |
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 | Trout Unlimited Canada, Environmental Improvement Group | Halton Region |
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 | TrueCare Medical Centre | Milton |
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 | Turning Point Youth Services, Wellesley Street Office, TPYS Shelter | Toronto |
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 | TVO ILC | Toronto |
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 | TVO ILC, TVO Mathify | Toronto |
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 | Tyandaga Tennis Club | Burlington |
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 | Tyrsa Ukrainian Dance and Bandura School | Burlington |