Свойства пирамидальных конструкций. Владимир Яшкардин Лекция 21 RUS
Вступление к конференции
“Пирамиды Санкт-Петербурга. Загадки и догадки.“
“Свойства пирамидальных конструкций.“
Владимир Яшкардин
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