What does circulate book mean?

Excuse me, could you clarify what you mean by "circulate book"? This phrase doesn't seem to be a commonly used term in finance or cryptocurrency circles. Are you perhaps referring to a book that is being widely distributed or read by many people? Or is there a specific context or industry where "circulate book" is a recognized term? Without more context, it's difficult to give an accurate definition. Could you please provide some additional information or clarify your question?