( 1) General reference
OS 1:2500 1882
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( 2) General reference
JRIC 9 1889 496
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( 3) General reference
VCH Corn 1 1906 396-397 plan 390 (G F Tregelles)
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( 4) General reference
BAR 81 1980 Megalithic Rings 76-7 plan (A & A S Thom)
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( 5) General reference
RCHME Field Investigation 10-SEP-83 N.V Quinnell
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