Three-age system

system for categorizing prehistory

en-GB/ˈθɹiː - ˈeɪd͡ʒ ˈsɪstəm/
en-US/ˈθɹi - ˈeɪd͡ʒ ˈsɪstəm/

ক্যাটাগরি:

classification scheme