>http://www.unicode.org/charts/PDF/U0400.pdf

This is OK.

>http://www.unicode.org/charts/PDF/U2DE0.pdf

I'm unsure whether Old Church Slavonic widely used nowadays. It's like Old English—i've never seen any modern texts which uses it.

>http://www.unicode.org/charts/PDF/UA640.pdf

Looks meaningless as well.