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=Textbook=
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#karnataka Textbook [http://ktbs.kar.nic.in/New/Textbooks/class-x/english/socialscience/class-x-english-socialscience-geography09.pdf Transport System oF India]
=Additional References=
=Additional References=
==How the topic is discussed in NCERT Books==
==How the topic is discussed in NCERT Books==