Green’s Dictionary of Slang

(Aus.) a book, a reading book, or as a ‘bookie;’ thus make a docker’s hook v., to lay the odds or make a book.

1968		J. Alard He who Shoots Last 129: Dat’s him over dere, wif his head stuck in a left hook. [Ibid.] 261: left hook Book.
1998		R. Puxley Fresh Rabbit.
2002		Pete’s Aussie Sl. Home Page 🌐 docker’s hook: a book, i.e. make a docker’s hook: to lay the odds or make a book.