It only uses the line but creates a effect. It has the letter "B" in front and the logo looks like a book; I think the logo completely presents a clear message about what it is to people.
Technical Design College Logo Digital School - Co llege Logo Templates
Logo design by Freytag Anderson for Little Black Book. ------- The space between the "B" and the outline of the book leaves room for a beautiful shape of negative space inside the book.
Logo by London-based design studio, private press and typography workshop The Counter Press for UK independent publisher Rattis Books.
Logospire - a logo inspiration gallery
Owl+Book Logo Design