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61Published 1973“...Pennsylvania State University Press,...”
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62Published 1975“...Pennsylvania State University Press,...”
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63
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64Published 1971“...Pennsylvania State University Press,...”
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65
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66
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67by Wilkes, G. A. (Gerald Alfred), 1927-“...Pennsylvania State University Press,...”
Published 1970
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68
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69
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70Published 1968“...Pennsylvania State University Press,...”
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71
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72
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73by Browning, Robert Marcellus, 1911-“...Pennsylvania State University Press,...”
Published 1971
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74
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75
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76
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77
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78by Schlegel, Friedrich von, 1772-1829“...[Pennsylvania State University Press],...”
Published 1968
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79by Swanson, Donald C. (Donald Carl), 1914-1976“...Pennsylvania State University Press,...”
Published 1970
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80