?? ???? Calx ?? ????? ??? ???. ??? ?? ??? 1807 ???? Davy. Knop ?? ??? 1860 ???? ??? ?? ???? ?????? ????? ????? ???.
https://www.powershow.com/view/3c2c23-NmZlN/Calx_1807_Davy_Knop_1860_powerpoint_ppt_presentation
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