With embedded words I was thinking along the lines like one in the word none, for example.
I know, and that's just the kind of embedded words challenge which I do not like.
There are basically two reasons:
One and more important, this really changes the theme of the challenge away from the numbers. "Gone with the wind" is not a number 1 book IMHO, neither is the history of Marxism anything about an 11 (roman XI). So what actually happens is that it becomes a challenge about finding specific letter sequences in unspecific words instead of finding books with numbers in the titles.
Two, embedded words are something which happens very differently frequently in various languages. So, the difficulty of finding books depends on the language someone usually releases.
However, do not mix "embedded word" and "compound word": While embedded words as the term usually is used in this forum are words where the "part" is simply randomly contained, compound words are "made" from several parts. Example: "seagull" is built from "sea" and "gull". So it's still about the sea.
I learned over the years that basically nobody, at least hardly anyone from english speaking parts of the world, joins these thoughts, so I decided to drop out and simply leave the challenges to the people who like letter sequence challenges whatever they may be called.