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References
1.
Thom
A.
, Megalithic lunar observatories (Oxford , 1971 ).
2.
Thom
, op cit. ;
Minnaert
M. G. M.
, The nature of light and colour in the open air (New York , 1954 ).
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Liller
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5.
See, for example,
Hawkins
G. S.
, Beyond Stonehenge (New York , 1973 ).
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A. F.
, “Astronomy in ancient Mesoamerica” , in In search of ancient astronomies , ed. by
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