In the words of Google,
"
It turns out that not all the world's information is already on the Internet".
To address this, Google have started to index extracts from books - often
including the cover blurbs, which are a readily available approximate
summary of the contents.
The books included in this initial batch number about 7000, and include
both fiction and non-fiction books. See what shows up for
windmill
or
watermill.
Some of the books it shows up are expected, such as
Devices and Desires
by PD James, others are a surprise, such as
The Complete War of the Worlds
relating the furore this 1938 radio broadcast caused.
It seems topical to relate that the extract from Lord Of the Rings
is one including