AMHERST - Thousands of books from local library sales made their way across the country this week, headed for Navajo readers 2,300 miles away. Reader to Reader, an Amherst organization that has collected and given away 2.5 million books in the past eight years, received a visit this week from Irving Nelson of the Navajo Nation Library in Window Rock, Ariz. On Tuesday, he and an associate rented a 26-foot truck and loaded 10,000 books, along with 10 computers donated by Amherst College, into it.