At present, due to copyright reasons, digital libraries in Guo Tu generally preview the first 20 pages or so.

If you want to read the whole content, there are several ways: first, ask for a paper book according to the information; The second is to log in to the database with your reader card, such as Founder e-book database, to see if there is this book; Third, wait patiently to see if this book has any copyright to donate to the national map. The first one is the most reliable.

If you need this book for remote viewing, it is the easiest to buy it according to the information. If not, you can use the "document provision" provided on the homepage of the national map to obtain it remotely, so you have to call for advice.

BS two people who don't know the situation, the national map is almost free except for copying, printing, liquidated damages and late fees.