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1
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2
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3
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4Published 1991“...Walker's Western Research,...”
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5
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6
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7Published 1800“...W. Walker & Sons,...”
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8
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10Published 2003“...Walter de Gruyter,...”
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11
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13Published 1915“...Frank R. Walker Co.,...”
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14
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15
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18Published 2016“...Walter de Gruyter GmbH,...”
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19
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20