Elba
2 of the 7 encyclopedias on this shelf carry an entry for Elba. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
a small island belonging to the Kingdom of Italy, in the Mediterranean Sea, off the coast of Tuscany, and with several much smaller isles, lying at the mouth of the Gulf of Piombino. The island of Elba is 18 miles from E. to W., with a width varying from 22 to 12 miles in its widest part. The mountainous districts of the island yield quantities of superior iron, marble, loadstones, and alum, besides wines and fruits. On the first abdication of Napoleon in 1814, a residence a Elba was assigned to him as and empire. Here he accordingly took up his residence, in the month of May; and on Feb. 26, 1815, he secretly left the island, and, landing in France, began that brief and final career known in history as the Hundred Days. Elba was a place of celebrity in the time of the Romans, and famed then, as now, for its yield of iron. Pop. about 25,500.
Aiton's Encyclopedia (1910)
an island in the Mediterranean. It lies between the northern end of Corsica and the mainland of Italy. It is about eighteen miles long and twelve miles wide. Its iron mines were celebrated in the days of the Romans, and are still worked. Its quarries supply a superior quality of marble and alum. It is a land of vineyards and orchards. Elba is noted in history. At Napoleon's downfall in 1814 it was a serious question of what to do with him. He was assigned the island of Elba as a residence, and also as an empire. It was proposed to give him a princely income and allow him to retain royal rank. The island, however, was entirely too small for a man of his ambition. He left for the coast of France and inaugurated the campaign which resulted in Waterloo and in his banishment to St. Helena. Elba belongs to Italy. Population, 25,480.