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1
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2
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3
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4Published 1954.“…Groningen [etc.],…”
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7
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8
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9Published ca. 1948.“…Groningen [etc.],…”
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11
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12
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13Published [1954]“…Groningen [etc.],…”
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14
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15
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16Published 1957.“…Groningen etc.,…”
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17Published 1973.“…State University of Groningen [etc.],…”
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18
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19
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20Published 1976.“…State University of Groningen [etc.],…”
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