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Bradford’s zones.
| Zone | Number of Documents in Thirds (%) | Journals (%) | Bradford Multipliers |
Journals (Theoretical Series) |
|||
|---|---|---|---|---|---|---|---|
| Core | 99 | 30% | 15 | 7% | 15 × (n0) | 15 | |
| Zone I | 81 | 24% | 35 | 17% | 2.3 | 15 × (n1) | 51 |
| Zone II | 153 | 46% | 153 | 75% | 4.4 | 15 × (n2) | 173 |
| Total | 333 | 100% | 203 | 100% | 3.4 | 239 | |
| % Error | −17.7% | ||||||
