Astonished library officials have received a car repair manual that was borrowed in 1975 in the post together with a letter of apology. The Washington County Library System said the book, called Chilton's Foreign Car Repair Manual: German, Swedish, Italian Cars, Vol. 1, had been sent to one of their branch libraries by post. An anonymous letter included with the package to the Lake Elmo Library said that the person who borrowed it had been trying to repair a Mercedes-Benz more than 30 years ago.