Preface. List of Contributors. 1. Hairy Cell Leukemia: A Historical Overview. 2. Hairy Cell Leukemia: Clinical Course. 3. Immunological Research in Hairy Cell Leukemia. 4. Treatment of Hairy Cell Leukemia. 5. Cytology and Cytochemistry of Chronic Lymphocytic Leukemia and Hairy Cell Leukemia. 6. Natural History of Chronic Lymphocytic Leukemia. 7. Infection in Hairy Cell Leukemia and Chronic Lymphocytic Leukemia. 8. Immunological Research in Chronic Lymphocytic Leukemia. 9. Immune Hematocytopenia in Lymphoproliferative Disorders. 10. Radiation Therapy in the Management of Chronic Lymphocytic Leukemia and Hairy Cell Leukemia. 11. The Relationship between Lymphoma and Chronic Lymphocytic Leukemia. 12. Treatment of Chronic Lymphocytic Leukemia.