1)The earliestbooks were written on tablets of wood or pieces of bark.
2)in ancient Rome
3)William Caxton ,at Westminster in 1476
4)scientists
5)in the 19th century
6)Oxford and Cambridge in England , Harvard and Yale in the U.S ,
7)the British Museum Library in London,The library of Congress in U.S , Bibliotheque Nationale in France, the Beijing in China , the state public library in Moscow