There are three kinds of travel books. / The first are those that give a personal, subjective account of travels / which the author has actually made himself. / If these books are informative / and have a good index，/ they can be very useful to you / when you are planning your travels. / The second can be classified as selective guidebooks / whose purpose is to give a purely objective description of things to be done and seen. / The third are those books which are called “a guide" to some place or other. / They will give an analysis or an interpretation. / They can be as inspiring and entertaining as the first kind，/ but their primary function is to assist the reader / who wishes to plan his tour / in the most practical way. /