No 4 pool steam (1018/1776):

1017: No 4 panel room off shaft
1016: No 4 north wall
1015: No 4 legend
1014: No 4 large
1013: No 4 elevator shaft.
1012: No 4 Dec 11
1011: No 4 control rods
1010: No 4 control rods small
1009: No 4 close up
1008: no 4 cap zoom bolts

1019: No 4 pool
1020: No 4 SFP B
1021: No 4 SFP
1022: No 4 shaft B
1023: No 4 shaft
1024: No 4 stairs
1025: No 4 west side 3
1026: LEAD Technologies Inc. V1.01
1027: No 6 cap removal B
1028: No 6 cap removal Big