Б. М. Булычёв. Супрамолекулярная химия: краун-эфиры (проект МГУ им. М. В. Ломоносова “teach-in“)
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![Империя без крестьян. Причины революции [разбор Асафьева]](https://sun9-80.userapi.com/r4c69Bi2Qlp0NFxAV6v18_md60A9_b28GkEI3Q/JTABaoHT_R8.jpg)
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