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1997.18.0250 (86-72)

Room A4, flue to the Circular Building ... west 4780 Horizontal (normal) ... 3 Jul 1969 ... Room A4, flue to the Circular Building.

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2012.57.1432 (86-72)

Room A4, flue to the Circular Building ... AMS west 4780 Horizontal (normal) ... 3 Jul 1969 ... Room A4, flue to the Circular Building.

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2012.41.1163 (Section ΟΟ 847)

Stratification in Room A4, bedrock at bottom. From the north ... AMS Horizontal (normal) ... Stratification in Room A4, bedrock at bottom.

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1997.18.0219 (85-580)

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.