=LDR 22 4500 =001 3722 =082 04$a973 EST =100 1\$aEstall, R. C. =245 10$aA Modern Geography of the United States: aspects of life and economy =260 \\$aHarmondsworth :$bPenguin,$c1972 =650 \0$aBooks =852 \\$bFreeman Library$h973 EST