=LDR 22 4500 =001 4021 =082 04$a333.760942 DOD =100 1\$aDodgshon, R. A. =245 10$aThe origin of British field systems: an interpretation =260 \\$aSan Diego :$bAcademic Press,$c1980 =650 \0$aBooks =852 \\$bFreeman Library$h333.760942 DOD