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river, c.1,130 mi (1,819 km) long, W Siberian Russia and Kazakhstan. It rises N of Qaraghandy in Kazakhstan (where it is known as the Esil), flows W p...
( tsä´) (KEY) , Maya of Yucatán (Mexico) and Petén (Guatemala). Probable founders of Chichén Itzá, which they occupied at various times from c.5...
(ly f vä´nôf) (KEY) , 1834–1901, Russian dancer, teacher, choreographer, and ballet-master. Ivanov was assistant to chief ballet-master Marius P...
( s ´ N) (KEY) , town (1991 est. pop. 192,000), SW Nigeria. The city, located in a tobacco-growing region, has an important traditional textile indus...
( ´z ngl s´´) (KEY) , gelatinous semitransparent substance obtained by cleaning and drying the air bladders of the sturgeon, cod, hake, and other f...
( ´s m r) (KEY) , in chemistry, one of two or more compounds having the same molecular formula but different structures (arrangements of atoms in the...