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If you want to go to DEE/NZM/DLI from NDLS via BUS than this info might be helpful to you.
NDLS-DEE
Buses - (AC Fare 25 and NON-AC 15)
166/181 (PF-1 side)
39 (Pf-16 side)...
more...

918 (Pf-16 side)
957 (Pf-16 side)
.
NDLS-NZM
Buses - (AC Fare 25 and NON-AC 15)
181 (PF-1 side)
166 (PF-1 side)
894 (PF-1 side) will not go inside stn, but will drop outside
.
NDLS-DLI
I would not recommend bus for DLI, as metro is very well connected from NDLS-DLI (PF-16 side)
NOTE:
Alighting at PF-1 side, its hardly 2 mins walk to the bus stoppage.
Alighting at PF-16 side, will require 5 mins walk to the bus stop (can be painful with luggage)
.
There might be few other bus numbers which also ply but these bus numbers are immensely popular and have quick service.
HAPPY JOURNEY.