1
Опубликовано 1969
Full text available from Education Database: 10/01/1997 to present
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Электронный ресурс Журнал
2
Full text available from Education Database: 04/01/1999 to present
Электронный ресурс Журнал
3
Опубликовано 1991
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Электронный ресурс Журнал
4
Опубликовано 1982
Full text available from ABI/INFORM Trade & Industry: 08/01/2000 to 11/30/2001
Электронный ресурс Журнал
5
Опубликовано 1997
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Электронный ресурс Серия
6
Опубликовано 1991
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Электронный ресурс Журнал
9
Опубликовано 2004
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Электронный ресурс Журнал
11
Available in Education Source.
Электронный ресурс Журнал
12
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Электронный ресурс Журнал
13
Опубликовано 1969
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Электронный ресурс Журнал