 Complete the following phrase:  Museums started holding large loan exhibitions of historic art in the late 19th century, as also did the Royal Academy, but the modern blockbuster museum exhibition, with long queues and a large illustrated catalogue, is generally agreed to have been introduced by the exhibitions of artifacts from the tomb of Tutankhamun held in several cities in the 1970s. Many exhibitions, especially in the days before good photographs were available, are important in stimulating research in art history; the 