Pre and protohistoric stone architectures : comparisons of the social and technical contexts associated to their building : proceedings of the XVIII UISPP World Congress (4-9 June 2018, Paris, France).: comparisons of the social and technical contexts associated to their building : proceedings of the XVIII UISPP World Congress (4-9 June 2018, Paris, France). Session XXXII-3 / Volume 1, (2020)