The Oxford English Dictionary normally has 20 volumes,
but there is a "Compact" edition where each page has 9 pages
of the original text, reduced photographically, to make a single
volume of 2424 pages; i.e., 21,816 normal pages.
Really quite a wonderful thing to read if you ever want to dive
deep into the meaning and history of words, though easier if
you have access to the online version.
https://en.wikipedia.org/wiki/Oxford...mpact_editions
https://www.amazon.com/Dictionary-Co...dp/0198612583/