A 12 chapters book published in 2005 by NCBI provides detailed description of all blood groups with their history and clinical significance.
A hematology handbook for revision by MCCQE. Useful for medical students preparing for USMLE and Canadian board exam .
http://www.angelfire.com
By University of Washington School of Medicine .
http://eduserv.hscer.washington.edu
Interactive hematology cases by American Society of Hematology.
http://www.hematology.org
Web cases by University of Minnesota
www1.umn.edu/hema/
With image atlas, case studies and hematology glossary.
http://www.bloodline.net/