For a very small library a common blank-book will do.
Agreement blanks, which the borrower signs before getting his borrower's card giving him the right to use the library.

See chapter on charging systems.
Book cards.

See chapter on charging systems, and Library Bureau catalog.
Book pockets.

See Library Bureau catalog, and also chapter on charging systems.
Borrowers' cards.

Given to borrowers as evidence of their right to draw books.