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61by Heinlein, Robert A. (Robert Anson), 1907-1988“...Gregg Press science fiction series....”
Published 1978
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62
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63
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64
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65
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66
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67
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68by Defontenay, C. I. (Charlemagne Ischir), 1814-1856“...Gregg Press science fiction series....”
Published 1976
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69
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70Published 1976“...Gregg Press science fiction series....”
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71by Clarke, Arthur C. (Arthur Charles), 1917-2008“...Gregg Press science fiction series....”
Published 1979
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72
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73
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74
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75
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76
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77
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78
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79
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80by Aldiss, Brian W. (Brian Wilson), 1925-“...Gregg Press science fiction series....”
Published 1978
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