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• National Digital Library of India (ndl.iitkgp.ac.in)
• Shodhganga (for reference)
• Inflibnet

: Climatic, topographic, edaphic (soil), and biotic factors. Biological Science

• Internet Archive (for possible lending copies)
• Google Books (limited preview)
• Your university library or interlibrary loan
• Legal secondhand bookstores

Population & Community: Structure, dynamics, and ecological succession. Ecosystems: Global and Indian environmental components.