Common Hardware and Software 
Cylinder Head Sector 
Common Hardware Systems 
Canadian Hydrographic Service 
Community Health Sciences 
Cylinder Head Sectors 
Cardiovascular Health Study 
Central High School 
chapters 
Charlotte Southern Railroad 
Claremont High School 
Collimated Hole Structure 
Combat Health Support 
Common Hardware Software 
Common Hardware Suite 
Communications and Hybrid Systems 
Compact Helical System 
Concord High School 
Cylinder, Head and Sector 
Cabinet for Health Services 
Cabramatta High School 
Cabrillo High School 
Cajon High School 
Calabasas High School 
Calaveras High School 
Calexico High School 
California High School 
California Historical Society 
Calipatria High School 
calvarial hyperostotic syndrome