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221Published 1990“...QC 491 .I61 1989...”
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222Published 1987“...QC 851 .C636 s...”
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223Published 1990“...QC 903 .E12...”
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224Published 1990“...QC 173.4 .S94 .M196...”
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225Published 1990“...QC 851 .C861...”
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226Published 1992“...QC 20.7 .D5 .P147...”
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227Published 1991“...QC 173.4 .C65 .I61...”
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228Published 1990“...QC 611.9 .E12...”
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229
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230Published 1971“...QC 449 .U58 2nd...”
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231
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232Published 1991“...QC 981.8 .C5 .G813...”
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233Published 1990“...QC 320.22 .E43 .A244...”
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234Published 1990“...QC 881.2 .M53 .N02972...”
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235
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236Published 1989“...QC 912.3 .E566...”
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237Published 1992“...QC 981.8 .G56 .E89...”
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238Published 1992“...QC 879.232 .A6 .A938 1992...”
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239Published 1991“...QC 981.8 .C5 .W927 1990...”
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240