1. Electron microscopy of the thymus of the chick embryo;Ackerman;Anat. Rec.,1964
2. Lymphocytopoiesis in the bursa of Fabricius;Ackerman;Am. J. Anat.,1959
3. Lymphocytopoiesis in the embryonic thymus and bursa of Fabricius;Ackerman;Blood,1963
4. Lymphocyte formation in the thymus of the embryonic chick;Ackerman;Anat. Rec.,1964a
5. Lymphocyte formation in the thymus of the embryonic chick;Ackerman;Anat. Rec.,1964b