No 4 stairs (1024/1776):

1023: No 4 shaft
1022: No 4 shaft B
1021: No 4 SFP
1020: No 4 SFP B
1019: No 4 pool
1018: No 4 pool steam
1017: No 4 panel room off shaft
1016: No 4 north wall
1015: No 4 legend
1014: No 4 large

1025: No 4 west side 3
1026: LEAD Technologies Inc. V1.01
1027: No 6 cap removal B
1028: No 6 cap removal Big
1029: No 6 refueling bigger
1030: No 6 refueling
1031: No 22 10 small
1032: No hot linking
1033: no idea 9, 11
1034: no nukes