American Society for Hematology: Blood Disease Information
The mission of the American Society of Hematology (ASH) is to further the understanding, diagnosis, treatment, and prevention of disorders affecting the blood, bone marrow, and the immunologic, hemostatic and vascular systems, by promoting research, clinical care, education, training, and advocacy in hematology.

MedlinePlus: Sickle Cell Anemia
Sickle cell anemia is a disease in which your body produces abnormally shaped red blood cells.

National Heart, Lung, & Blood Institute: Blood Diseases
The National Heart, Lung, and Blood Institute (NHLBI) provides leadership for a national program in diseases of the heart, blood vessels, lung, and blood; blood resources; and sleep disorders.

National Hemophilia Foundation
The National Hemophilia Foundation is dedicated to finding better treatments and cures for bleeding and clotting disorders and to preventing the complications of these disorders through education, advocacy and research.

Nemours Foundation, TeensHealth: Blood
Just about everyone knows that we can't live without blood. And that the blood in our bodies is pumped by the heart through a network of arteries and veins. But beyond those blood basics, what do you know about that red stuff beneath your skin?