61
62
by Kautsky, Karl
Published 1908
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63
65
by Poppe, Louis J.C.
Published 1933
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66
by Gleserman, G., Koursanov, G.
Published 1968
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67
by Vertongen, Lucien
Published [1914]
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72
by Allison, Dorothy
Published 1995
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74
75
by Mury, Gilbert
Published 1964
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79
by Fimmen, Edo
Published 1924
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80
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