https://www.exercisebookarchive.org/books/chn7079xm77781/ https://www.exercisebookarchive.org/books/chn7079xm77781/ Based on the content on the page, the year

https://www.exercisebookarchive.org/books/chn7079xm77781/ https://www.exercisebookarchive.org/books/chn7079xm77781/ Based on the content on the page, the year of this book should be 67, not 77.