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Name
Date
Chronology
 
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Α-128 May 1931-23 June 1931  
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Α-224 June 1931- 14 July 1931  
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Α-314 July 1931-7 August 1931  
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Α-48 August 1931- 7 September 1931
1 February 1932-19 February 1932
  
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Α-520 February 1932-21 March 1932; 6 April, 1932  
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Α-620 May 1932.
Rectangular Rock-Cut Shaft (Vanderpool): 15 August 1932-15 October 1932, 9-24 December 1932.
May, June 1933.
25 May 1934-31 May 1934.
23 February 1935-5 March 1935.
  
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Α-74 February 1935-31 May 1935
June 1936
  
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Α-81935, 1936