na INLIS000000000046134 eng 0010-0617005026 Epidemilogy in medical practice D.J.P. Barker Barker, D.J.P. 3 rd. ed. Churchill Livingstone, 1984 viii, 158 : ilus. 23 cm. 614.4 Bar e 1 614.4 EPIDEMILOGY 115088112 114988112