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| 92 | | C70 |
Collier's Encyclopedia [Текст] : with Bibliography and Index : in 24 vol. Vol. 11 : Germanium to Heath Hen / editorial director W. D. Halsey ; editor in chief L. Shores. – [USA] : Crowell-Collier Educational Corporation, 1968. – 760 p. – 30.00.
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