In what circumstances will the prosecution refuse to produce a copy of a police notebook?

In People v. Burch, 196 Cal.App.2d 754, 17 Cal.Rptr. 102, wherein the defendant sought an order for production of a notebook used by an officer in his investigation of the case, the prosecution delivered one of the pages of the book. It was said therein (196 Cal.App.2d p. 763, 17 Cal.Rptr. p. 107): 'Appellant shows no abuse of the trial court's discretion. The court examined the whole book and found nothing in it except the one page which applied to the case. The court expressly stated: '[T]here's nothing that refers to your client in that book except what you saw, and everything else applies to some other case * * *.''