Guam
2 of the 7 encyclopedias on this shelf carry an entry for Guam. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
an island in the Pacific Ocean, the largest of the Marianne or Ladrone group; area, 200 square miles; capital, Agaña. The island is fertile and to a great extent covered with valuable timber lands. There are 18 schools and about 90 per cent. of the natives can read and write. At the beginning of the American-Spanish War the Ladrone group belonged to Spain, and on June 20, 1898, the United States cruiser "Charleston," on its way to Manila, opened fire on Agana. The Spanish garrison, not knowing that war existed, and thinking the attack was a salute, sent an officer to the "Charleston" apologizing for not returning it, owing to lack of ammunition. When they learned the state of affairs, the place was surrendered in less than 30 minutes. Captain Leary, of the United States navy, was appointed the first American governor, and under his direction important reforms were instituted. Slavery was abolished, and a break-water and fortifications were built at the harbor of San Luis d'Apra, to establish a coaling station there. United States money has been in circulation since 1909. Pop. 13,275. See AGAÑA.
Aiton's Encyclopedia (1910)
gwam, a volcanic island, the most southern of the Ladrones. It is situated in the Atlantic, 1,500 miles east of the Philippines. It has been occupied by the United States since 1898 as a coaling station. Its area is about that of Rhode Island . There are about 9,000 inhabitants, chiefly of Malay origin, said to be poor, ignorant, and squalid, but peaceful and pious. The use of domestic animals, together with tobacco, melons, hemp, rice, sugar-cane, coffee, and bananas has been introduced. A large part of the island is covered with jungles in which several kinds of timber, valuable for furniture making, are found. The cocoanuts, pineapples, and breadfruit are of a superior quality. Rats, bats, harmless centipedes, scorpions, and brightly colored birds are found in the island, but there are no ferocious wild animals. Missions have existed for some time. Schools have been established by the United States government. See United States