What does ISBN, the code found on books at a library or bookstore, stand for?

At the hip joint, which thighbone joins the pelvis? At President Nkrumah's invitation, the first overseas Peace Corps volunteers arrived in which Gulf of Guinea country in… At the 1996 auction of Jacqueline Kennedy Onassis's estate, which kind of chair used by JFK sold for $442,500? At a June 4, 1974 game in Cleveland, which refreshment cost only 10 cents, a promotion that ended in a riot? At the Minnesota State Fair in 1901, which vice president gave his "speak softly and carry a big stick" speech? At the mouth of the Cape Fear River, Old Baldy, built in 1817, is which state's oldest standing lighthouse? At the mouth of the Mississippi River, deposits of which major class of rock are said to be more than 40,000 feet thick? Which 1997 film followed "Batman," "Batman Returns" and "Batman Forever" in the series?