Columbia subject headings:
Kalka-Shimla Railway--Pictorial works.
Kaushal, Sanjay--Travel--India--Haryana--Pictorial works.
Kaushal, Sanjay--Travel--India--Himachal Pradesh--Pictorial works.
Narrow gauge railroads--India--Haryana--Pictorial works.
Narrow gauge railroads--India--Himachal Pradesh--Pictorial works.
Shubh Mohan Singh--Travel--India--Haryana--Pictorial works.
Shubh Mohan Singh--Travel--India--Himachal Pradesh--Pictorial works.
Harvard subject headings:
Kalka-Shimla Railway--Pictorial works.
Narrow gauge railroads--India--Haryana--Pictorial works.
Narrow gauge railroads--India--Himachal Pradesh--Pictorial works.
Princeton subject headings: