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| 100 | 1 | _aBoyd, D R | |
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_aThe conceptual development of EMS systems in the United States, Part I. _h[electronic resource] |
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_bEmergency medical services _c |
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_a19-23 p. _bdigital |
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| 500 | _aPublication Type: Historical Article; Journal Article | ||
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| 650 | 0 | 4 | _aHistory, 19th Century |
| 650 | 0 | 4 | _aHistory, 20th Century |
| 650 | 0 | 4 | _aUnited States |
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_tEmergency medical services _gvol. 11 _gno. 1 _gp. 19-23 |
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