Blanket Purchase Agreement
Compilations were frequent before the days of electronic research, and these compilations are frequently published in loose-leaf format. Additionally, treaties and conventions may also be found individually.
In legal terms, a contract is any agreement between parties to exchange things of value, such as goods and services for cash. A simple handshake agreement is legally binding, but its terms are not always provable if a dispute arises. However, you don't necessarily need pages upon pages of legalese. A basic contract agreement often works best for a simple business transaction.