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What is the "book of the law" mentioned in Joshua 1?

Specifically, Joshua 1:8:

Joshua 1:8 (JPS)

This book of the law shall not depart out of thy mouth, but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein; for then thou shalt make thy ways prosperous, and then thou shalt have good success.

What is this "book of the law" that God refers to here? Is it the Pentateuch?