| Carolinas Integrated Sciences and Assessments
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| Cascadia Consulting Group
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| Casco Bay Estuary Partnership
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| CDC National Center for Environmental Health—Climate and Health Program
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| CDC’s National Environmental Public Health Tracking Network
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| CDC National Institute for Occupational Safety and Health
|
| CeNCOOS Members and Partners
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| U.S. Census Bureau
|
| U.S. Centers for Disease Control and Prevention | Agency for Toxic Substances and Disease Registry
|
| U.S. Centers for Disease Control and Prevention
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| Centers for Disease Control and Prevention, Climate Health Program
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| Center for Heirs Property
|
| Center for Island Climate Adaptation and Policy
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| Center for Limnology
|
| Centers for Medicare & Medicaid Services
|
| Center for New York City Neighborhoods, Inc.
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| Center for Planning Excellence
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| Center for the Humid Tropics of Latin America and the Caribbean
|
| Central Council of Tlingit and Haida Indian Tribes
|
| Central Michigan University Institute for Great Lakes Research
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| CERES (Clouds and Earth's Radiance Energy) Mission
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| CH2M Hill (now Jacobs Engineering Group)
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| Charles City County, VA
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| Charleston Resilience Network
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| Charlotte-Mecklenburg Storm Water Services
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