"No Date" indicates no date of publication is given inside the book. [If we give a date in square brackets, that means that we’ve tracked down the correct date for you, which may be approximate].
When we use the term ‘association’ we usually mean that the book was owned by, and sometimes signed/annotated by someone noteworthy. This could be the author, an unrelated celebrity, the Gruffalo, or anyone we think you might find interesting - we will go into further detail in our description.