Rocks dug up during construction were saved and incorporated into the poured-concrete floors and walls. Hydronic heating coils in the floor are augmented by a wood stove during the damp winters.  Search “"비트맥스"【COBIT7.COM】강북점╈비트파이◀나무위키◈코인월드メ본사℃IFOREXŁ하는곳㉬acetoarsenite” from Diamond in the Rough (and Ready)

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Rocks dug up during construction were saved and incorporated into the poured-concrete floors and walls. Hydronic heating coils in the floor are augmented by a wood stove during the damp winters.