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| recto (The front or obverse side of a leaf; the right-hand page of an open book or manuscript); leaf; verso; front | |||
| first page | |||
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| face of a security | |||
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recto : 14 a las frases, 6 temas |
| Antenas y guías de onda. | 2 |
| Comunicaciones | 2 |
| Electrónica | 1 |
| General | 1 |
| Medicina | 7 |
| Tecnología de la información | 1 |