TY - JOUR T1 - Rheumatoid Factors in a Rural Population JF - Annals of the Rheumatic Diseases JO - Ann Rheum Dis SP - 497 LP - 508 DO - 10.1136/ard.25.6.497 VL - 25 IS - 6 AU - H. A. Valkenburg AU - J. Ball AU - T. A. Burch AU - P. H. Bennett AU - J. S. Lawrence Y1 - 1966/11/01 UR - http://ard.bmj.com/content/25/6/497.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -