Path Making July 1961 ... Ζ-18 3491, 3492 ... 29 Jul 1961
Ζ-18 3493, 3494 82-679 82-678 ... 27 Jul 1961
Early foundations along the east side of the West Branch of the Great Drain opposite Doric propylon ... east 3494 Horizontal (normal) ... 27 Jul 1961
Early foundations along the east side of the West Branch of the Great Drain opposite Doric propylon ... north 3493 Horizontal (normal) ... 27 Jul 1961