Read the passage and answer the question :'Perhaps the most unique features of the Harappan civilisation was the development of urban centres. They had citadel and the lower towns. One of the most distinctive features of Harapppan cities was the carefully planned drainage system. The roads intersected at right angles and were well planned.'Who was the Director General of the Archaeological Survey of India in 1875 ?( – Answer & Explanation | CUET Subject PYQ – Dubuddy