What was the underground railroad?

Holdings

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142841150688602144644665328980VCJ433VCJ00100684973.7 WHO973.715814652241695044385
170443553169741784644665328980Barclay116BPBA036270973.7 MCD973.715825759371662467957
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281650663011632101644665328980HOE263HOE0044512326 McD32616377825731695044385
281650763011632101644665328980HOE263HOE0044513326 McD32616377825731695044385
286289863435152103644665328980MAE295MAE0024694973.7 MCD973.716377825731695044385
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298154464487682137644665328980PCE301PCC0034174973.7 McD973.716377825731695044385
298154564487682137644665328980PCE301PCC0034482973.7 McD973.716377825731695044385
303689064931912109644665328980PMM361PMM0102535973.7 MCD973.716377825731695044385
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3102968654928515626446653289808394T 880203973.71 MCD973.7116407292551640729255
310296965492851562644665328980839432616000002509973.7 MCD973.716407292551640729255
31727706604512156864466532898017171T011700043939N973.7 MCD973.716407292551640729255
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3196023662650915716446653289802318123000182973.7115 MCD973.7116407292551640729255
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383512667811332148644665017157T011700043939N973.7 MCD973.716976313411697631341
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3835128678113321486446650WOI 58157T 5827252973.7 MCD973.716976313411697631341
383512967811332148644665054157T 5480593973.7 MCD973.716976313411697631341
3835130678113321486446650815732616000002509973.7 MCD973.716976313411697631341
383513167811332148644665039157T 4430424973.7 MCD973.716976313411697631341
3835132678113321486446650East15732616000574649973.7 MCD973.716976313411697631341
387450371571362235644665328980HIVE259HIVE002776973.7 MCD973.717093078551709307855
388031871620752243644665328980SPTES425SPTL034931973.7 MCD PB973.717093078551709307855
388302371643872248644665328980ALEH90ALEH85722Swinehart100017095678151709567815