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Bone marrow, lymph nodes, spleen, tonsils, thymus and Peyer's patches in the small intestine, the liver, and the appendix are all parts of the lymphatic system.
Note: you may find bone marrow, thymus gland, spleen and lymph nodes in the same group (primary organs)- it depends on the author, the book and the importance of the role an specific organ plays in the immune system in that given context.