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- Co-digestión 1
- CO2 incorporado 1
- Coaching (Athletics) 1
- Coal-Production-El Salvador 1
- Coalición (Ciencias sociales)-El Salvador 1
- Coalition (Social sciences)-El Salvador 1
- Cobertura vegetal 2
- Coconut palm-Diseases and pests 2
- Cocotero-Enfermedades y plagas 2
- Cod-liver oil-El Salvador-19th century 1
- Codallos, Felipe, 1790-1849 1
- Coffee 2
- Coffee berry borer 1
- Coffee economy-El Salvador 2
- Coffee industry-El Salvador 7
- Coffee industry-El Salvador-1983 3
- Coffee industry-El Salvador-1984 4
- Coffee industry-Guatemala 1
- Coffee industry-History 1
- Coffee industry-Law and legislation-El Salvador 2