To book itself is to say that it is easy to create through the supplied blue paper a copy of the original. Provided you remember to put the paper between the respective sheets.
There are also books of Avery, which are self-copying. This I actually prefer because the blue paper but can lubricate before.
The pages are pre-punched and perforated, which facilitates tearing and insert element in a DIN A4 folder.
Conclusion ---- ----
This is a beautiful, useful booklet from Avery for cash-flow purposes, which can save you money!