Non-articular forms of rheumatoid arthritis : proceedings of the IV I.S.R.A. Symposium The Hague, October 20 and 21 1976 / ed. by T.E.W. Feltkamp ; on the occasion of the 50th anniversary of and organized by the Netherlands League Against RheumatismRadiological aspects of rheumatoid arthritis : proceedings of an international symposium, Amsterdam, May 19th-22nd, 1963 / ed. and transl.: Mary E. Carter