You might think of “my book” as a subset of yours. My book would be more likely to be useful (though hopefully not) and could be expanded to add the material necessary for yours. And your book would be a library in itself, there is no possible way that such a “book” would not span many volumes.
A single long “book” would have high quality cross links, well ordered reading sequences, a uniform style, no internal contradictions, etc. In that sense it’s a book as opposed to a library collection.
You might think of “my book” as a subset of yours. My book would be more likely to be useful (though hopefully not) and could be expanded to add the material necessary for yours. And your book would be a library in itself, there is no possible way that such a “book” would not span many volumes.
A single long “book” would have high quality cross links, well ordered reading sequences, a uniform style, no internal contradictions, etc. In that sense it’s a book as opposed to a library collection.