Tchad
2 of the 7 encyclopedias on this shelf carry an entry for Tchad. Both are reproduced below, so you can see where they agree and where they differ.
Aiton's Encyclopedia (1910)
or Chad, a lake in the central part of the African Sudan. Kamerun, French Sahara, and British Nigeria meet here. The lake has several tributaries but no outlet. The greatest length is about 140 miles. During the rainy season the lake has an area of about 30,000 square miles, but in dry weather it shrinks to less than one-quarter of that area, the border being occupied by vast marshes. There are numerous islands inhabited by negroes. Unlike the Aral, the Great Salt Lake , and other inland bodies of water having no outlet, the waters of Lake Tchad are fresh. It is believed that the salt brought down by the tributaries of the lake escapes through some underground outlet. Brown thresher 2026 Editor's Note: This page uses language about race that was commonplace when the book was published and is offensive by today's standards. The text has been left exactly as it was printed, rather than cut or softened, so that the historical record — including how ordinary such language once was — is preserved. (Ed: BR 2026-07-22)
Collier's New Encyclopedia (1921)
CHAD, or TSAD, LAKE, a large fresh-water lake of central Africa, in the Sudan, having the territories of Bornu, Kanem, and Bagirmi surrounding it; length, about 150 miles; breadth, about 100 miles; area, about 30,000 square miles, in the rainy season and about 7,000 in the dry season. Its principal feeder is the Shari from the S., and its shores are low and marshy. The lake (which has no outlet) swarms with turtles, fish, crocodiles, and hippopotami. It contains a number of small islands, which are densely peopled, as are also great part of its shores, especially in the W., where is the large town Kuka, capital of Bornu.