Great site!
A detailed groundplan is depicted in [1], some results of the 19th excavations are published in [2].
[1] M. Gruet, Inventaire des mégalithes de la France: 2-Maine-et-Loire. Supplément à "Gallia-Préhistoire", Paris, 1967, No.23, p 33-36
[2] O. Desmazières, “Note sur les Ossements humains des Sépultures préhistoriques et protohistoriques du département de Maine-et-Loire”, Bulletin de la Société préhistorique française , Année 1932 ,Volume 29 , Numéro 1, pp. 73-78
http://www.persee.fr/web/revues/home/prescript/article/bspf_0249-7638_1931_num_28_12_5914
The references use an alternative spelling “Mollières” and refer to it as “Dolmen de Mollières”.
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