Trench B at east. Lower right corner is Room 20. Behind is Room 23. From north ... AMS 810 Horizontal (normal) ... 6 May 1970 ... Lower right corner is Room20. Behind is Room 23.
Close of ΒΘ East Basket 20 in Room 5. [After Basket 20] ... Nicholas Seetin ... south Horizontal (normal) ... 23 Jun 2014 ... Close of ΒΘ East Basket 20 in Room 5. [After Basket 20]
Open of ΒΘ East Basket 20 in Room 5. [Before Basket 20] ... Nicholas Seetin ... northeast Horizontal (normal) ... 20 Jun 2014 ... Open of ΒΘ East Basket 20 in Room 5. [Before Basket 20]