California Jurisprudence, or CalJur as it's known in the legal community, provides 20+ volumes of highly detailed text and case annotations for virtually every aspect of California law, making it one of the most useful tools for California lawyers. It has been published in a few revised editions. The first edition appears to have been released in 1921. For at least the current edition and the one before it, after the edition was initially published in hardcover form, an annual paper update is provided, so that the edition is kept current.