=LDR 22 4500 =001 3624 =082 04$a303.4 WHI =100 1\$aWhite, Lynn =245 10$aMedieval technology and social change =260 \\$aAucklandAuckland :$bOxford University Press,$c1964 =650 \0$aBooks =852 \\$bFreeman Library$h303.4 WHI