Please watch the video it will give you the best description.  Please do your own research I do not speak russian and so I had to rely heavily on google  This book has  writing and notation in ink and pencil throughout the entire book.  I am not sure if somebody was learning the language or trying to correct the book.  I have clearly pointed it out in the video.  It also has what appears to be somebody's name written in the front of it.  (see last photo).  If you have any questions please reach out with what you would like a photo of and I will send it to you.