What is the name of your state? CA
What does 'court appearance condition-book only' mean?
I believe it means that when the person is picked up for the warrant, that they will be booked or processed, which basically consists of getting all their information, taking their picture and fingerprinting them. Then they would sign some form of promise to appear, like a citation, which would have the time and location they are scheduled to be in court and possibly the charges they are facing, or whatever the reason is that they are being summoned to court. Then, after the person signs this promise to appear, they would be released without having to post a bond. This may be done in order to bring someone to court on an infraction or for a civil matter.
Since I'm not 100 percent sure, maybe Carl will chime in when he sees this thread and if he's familiar with the term, then he can confirm whether my description is accurate or not.
Who is the warrant for and why do they believe it was issued? Did they miss a court date, fail to show up for jury duty or violate some other court order?