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| OCR reference control (A service from BGC that confirms the validity of an OCR reference number in the BG Max file. The user can confirm only the digits or also confirm the character length) | |||
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kontrola : 53 do fraz, 8 tematyki |
| Agronomia | 4 |
| Astronomia | 2 |
| Budownictwo | 35 |
| Ekonomia | 1 |
| Rolnictwo | 7 |
| Technika i technologia | 2 |
| Weterynaria | 1 |
| Zootechnika | 1 |