| Historical and Musical focal points |
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| Literature: general indications of currency |
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| Illustrations | ||
| overview |
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| problems in interpretation |
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| type
0, no bridges - oblong |
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| - trapezoid |
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| - more sculpted |
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| type 1 - one bridge |
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| type 2 - two bridges |
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| Strings |
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| Summary |
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