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At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
The Wayback Machine - https://web.archive.org/web/20150917082339/https://books.google.com/books?id=Li4eh7JIMtIC&printsec=frontcover&source=gbs_vpt_read
books.google.com - Galileo's 1632 book, "Dialogue on the Two Chief World Systems, Ptolemaic and Copernican," comes alive for twentieth-century readers thanks to Maurice Finocchiaro's brilliant new translation and presentation. Condemned by the Inquisition for its heretical proposition that the earth revolves around the...https://books.google.com/books/about/Galileo_on_the_World_Systems.html?id=Li4eh7JIMtIC&utm_source=gb-gplus-shareGalileo on the World Systems