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| Room A4, flue to the Circular Building ... AMS west 4780 Horizontal (normal) ... 3 Jul 1969 ... Room A4, flue to the Circular Building. |
| Room A4, flue to the Circular Building ... west 4780 Horizontal (normal) ... 3 Jul 1969 ... Room A4, flue to the Circular Building. |
| Stratification in Room A4, bedrock at bottom. From the north ... AMS Horizontal (normal) ... Stratification in Room A4, bedrock at bottom. |
| Detail, polygonal masonry, east wall of Room A4. From the west ... AMS Horizontal (normal) ... Detail, polygonal masonry, east wall of Room A4. From the west. |
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