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1
Visual symmetry
Опубліковано 2009An electronic book accessible through the World Wide Web; click to view
Електронний ресурс eКнига -
2
Hungarian problem book I based on the Eotvos Competitions, 1894-1905 /
Опубліковано 1963An electronic book accessible through the World Wide Web; click to view
Електронний ресурс eКнига -
3
Hungarian problem book III based on the Eotvos Competition, 1929-1943 /
Опубліковано 2001An electronic book accessible through the World Wide Web; click to view
Електронний ресурс eКнига -
4
Hungarian problem book II based on the Eotvos Competition, 1929-1943 /
Опубліковано 1963An electronic book accessible through the World Wide Web; click to view
Електронний ресурс eКнига -
5
Hungarian problem book IV
Опубліковано 2011An electronic book accessible through the World Wide Web; click to view
Електронний ресурс eКнига -
6
Fossils of the Carpathian region /
Опубліковано 2014An electronic book accessible through the World Wide Web; click to view
Електронний ресурс eКнига