noun
: a book in which letters or copies of letters are kept especially to provide a running account of a business or enterprise
the general's letter books give an intimate picture of the campaign
noun
: a book in which letters or copies of letters are kept especially to provide a running account of a business or enterprise
the general's letter books give an intimate picture of the campaign
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012