Looking for Specific Book

I have too many books.  Everytime I look for a specific book, I have to search high and low - yes I do have a tall bookshelf that reach to the ceiling.  As I have more books that shelf space and my shelves are deep, I am putting my books double layers.   This makes it even more difficult to look for a specific as it can be hidden inside one of the shelves.  As I search, I saw many good books that I have not read yet.  It is really difficult to find time to read all the books I like.  I have almost all the books Peter Drucker wrote.  Also Henry Mintzberg.  Daniel Pink and Malcolm Gladwell are fairly young, so I have all the books they wrote and published.

I wonder how to read and learn from all the wise men in my library!