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Department Archives Remove constraint Department: Archives Subject Periodic table of the elements Remove constraint Subject: Periodic table of the elements Subject Mendeleyev, Dmitry Ivanovich, 1834-1907 Remove constraint Subject: Mendeleyev, Dmitry Ivanovich, 1834-1907 Subject Periodic law Remove constraint Subject: Periodic law Date 1920 to 1929 Remove constraint Date: <span class='from'>1920</span> to <span class='to'>1929</span>

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