No 4 legend (1015/1776):

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
1007: No 4 cap zoom bolts 2
1006: No 4 B
1005: No 4 April 11th blown truck entrance

1016: No 4 north wall
1017: No 4 panel room off shaft
1018: No 4 pool steam
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