The source of two Russian documents is the museum in Tarkhany (Главная страница - Государственный Лермонтовский музей-заповедник «Тарханы»).EDIT: At least a grammar error was corrected.
I see that you cannot provide even 1 (one) document on the purchase or sale of slaves in the USA. This is enough not to consider any of your statements serious.
Lack of information is also information. If the historian of metallurgy cannot provide descriptions of the open-hearth furnace, there is nothing to talk about with him. With the documents of slavery the same.