| Author(s): | Johns, Claude Hermann Walter |
| URL: | http://www.yale.edu/lawweb/avalon/medieval/hammpre.htm |
| Format: | Article |
| Date: | 1997 |
| Source: | Encyclopaedia Britannica (11th Edition) |
| Permalink: | http://etana.library.vanderbilt.edu/node/2382 |
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