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| Room A4, flue to the Circular Building ... west 4780 Horizontal (normal) ... 3 Jul 1969 ... Room A4, flue to the Circular Building. |
| Room A4, flue to the Circular Building ... AMS 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. |
| Room A4. Ancient bedrock cutting and large poros block under floor ... northeast 4214 Horizontal (normal) ... 18 Jun 1968 ... Room A4. Ancient bedrock cutting and large poros block under floor. |
| Room A4. Ancient bedrock cutting and large poros block under floor ... AMS northeast 4214 Horizontal (normal) ... 18 Jun 1968 ... Room A4. Ancient bedrock cutting and large poros block under floor. |
| 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. |
| 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. |
| Well E 18:7 in the Southwest Bath, Room A4. From the north ... Scanned 2005 for the 75th anniversary exhibition and publication. 4389 Horizontal (normal) ... 27 May 1969 ... Well E 18:7 in the Southwest Bath, Room A4. From the north. |
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