diaries
A diary is a book which has a separate space for each day of the year. You use a diary to write down things you plan to do, or to record what happens in your life day by day.
I had earlier read the entry from Harold Nicholson's diary for July 10, 1940.
我早就在哈罗德·尼科尔森1940年7月10日的日记里读到过那则记录。