USA Today reports that Google has suffered a setback in a coming copyright lawsuit because Yahoo has rebuffed Google’s effort to learn more about its efforts to create digital copies of books. Web retailer Amazon.com has also declined Google’s efforts earlier last month. Google believes it can defend its plans to provide online access to millions of library books by obtaining details about similar projects. Last year, a group of publishers and the Authors Guild sued Google alleging that Google didn’t get proper approval to make copies of books available to anyone with an internet connection. In the course of gathering evidence for its upcoming case, Google has subpoenaed Amazon.com, Yahoo, Microsoft, and others…