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| Наука (общее)\\Научно-популярное (513) |
| ||| (509) |
| 520/.92,B (1) |
| 523.1 (1) |
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| QB36.H83 S53 1989 (1) |
| Science (general)\\Scientific-popular (513) |
| Наука (общее)\\Научно-популярное (513) |
| ||| (509) |
| 520/.92,B (1) |
| 523.1 (1) |
| 523.1/8 (1) |
| 66092355 (1) |
| 724.9 (1) |
| NA500 (1) |
| QB36.H83 S53 1989 (1) |