Cal. Penal Code § 496b

Every person who, being a dealer in or collector of second-hand books or other literary material, or the agent, employee or representative of such dealer, or collector, buys or receives any book, manuscript, map, chart, or other work of literature, belonging to, and bearing any mark or indicia of ownership by a public or incorporated library, college or university, without ascertaining by diligent inquiry that the person selling or delivering the same has a legal right to do so, is guilty of criminally receiving such property in the first degree if such property be of the value of more than fifty dollars, and is punishable by imprisonment in the county jail for not more than one year, or by a fine of not more than twice the value of the property received, or by both such fine and imprisonment; and is guilty of criminally receiving such property in the second degree if such property be of the value of fifty dollars or under, and is punishable by imprisonment in the county jail for not more than one month, or by a fine of not more than twice the value of the property received, or by both such fine and imprisonment.