I have  a book that is missing part of the first title page.  The top corner (about a third of the way down the page to about  a third of the way across the top) has been neatly cut away.  It looks as though someone cut a sticker off the page.  The title of the book is there.  The next page is the complete title page. The book is in pristine, like new condition.  Is it postable? 

**ETA** The only thing I can see in the help docs that might apply has to do with TEXT pages.  All of these must be present and accounted for and not loose.  I can't find anything about non text pages.

From the page in the Help Center on Book Condition Criteria for 'Swappability' at PBS:

Pages:

• No torn or chewed/gnawed pages
  • yes, that does say "chewed/gnawed".  That means no pet-chewed (or human-chewed) books.
• No loose or missing text pages

The italicized, bolded, underlined word "text" is not that way in the HC, I just did it so that you could more clearly see that torn, missing, chewed, loose, or missing pages all refers to  TEXT pages. If they are non-text pgs, the previous rules do not apply and they may be removed or whatever.

There can be a gray area in what people define as text pages. Here is my opinion:

Text pages are pages that are story pages, or pages written by the author (or editor of the book) that are unique to the publication (preface, table of contents, index, bibliography, author's notes, etc).

Things that are not text pages: book review pages, blank pages, title pages, book advertisement pages, listing of other books by the same author page, copyright page.

Of course, this is my opinion. Others feel that any page with writing on it is a text page ... but I think there is some consensus (in the forums anyway) on some of the pages with text on them: (that review pages and particularly the ancillary book advertising pages) do not count as text pages.

In my opinion, the page that is partly missing could be removed completely and the book would be postable.