Colorectal

American Society of Clinical Oncology
Guideline for follow-up care, including recommendations for examinations, CEA tests, colonoscopy and sigmoidoscopy exams, and CT scans.
http://www.asco.org/practice-guidelines/quality-guidelines/guidelines/gastrointestinal-cancer#/10246

National Cancer Institute/Colorectal Cancer
Information, resources, and links pertaining to colorectal cancer survivorship.
http://www.cancer.gov/cancertopics/types/colon-and-rectal

National Comprehensive Cancer Network (NCCN) Guidelines
Guidelines for colorectal cancer follow-up; available for free, but registration required.
http://www.nccn.org/professionals/physician_gls/f_guidelines.asp

American Cancer Society 
Survivorship guideline for primary care providers.  
http://www.cancer.org/healthy/informationforhealthcareprofessionals/acsguidelines/colorectalcancersurvivorshipcareguidelines/