| FMT
| SE |
| LDR
| 00000nas a2200000zi 4500 |
| 001
| 000081128 |
| 005
| 20040602111718.0 |
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| 210192c19889999xxuqr_p_d_________a_eng_d |
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| |a 0895-6820 |
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| |a SER01000081128 |
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| |a MX-MxUNAM |b spa |e rda |c MX-MxUNAM |
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| |a eng |
| 05014
| |a Q1 |
| 08214
| |a 505 |
| 2101
| |a 21st. century sci. technol. |
| 22200
| |a 21st. century science & technology |
| 24500
| |a 21st. century science & technology |
| 24610
| |a 21 century (Washington, D.C.) |
| 24610
| |a 21st century science and technology |
| 24610
| |a Twenty-first century science and technology |
| 24610
| |a 2lst century science & technology |
| 264 1
| |a Washington, D.C. : |b 21st Century Science Associates, |c 1988- |
| 310
| |a Trimestral |
| 321
| |a Bimestral |
| 336
| |a texto |2 rdacontent |
| 337
| |a sin medio |2 rdamedia |
| 338
| |a volumen |2 rdacarrier |
| 500
| |a Inicia en 1988 con el vol. 1, no. 1 |
| 515
| |a Número de mar.-abr. 1988 también llamado "Premier issue" |
| 650-4
| |a Ciencia. |
| 650-4
| |a Tecnología. |
| 650-4
| |a Ciencia |z Estados Unidos. |
| 650-4
| |a Tecnologia |z Estados Unidos. |
| 650-4
| |a Divulgación científica |z Estados Unidos. |
| SYS
| 000081128 |
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