Who wrote the 1798 treatise 'An Essay on the Principle of Population'?
who wrote the 1798 treatise 'an essay on the principle of population'
FreebaseQA-train-6852.P0
essay on the principle of population
an essay on the principle of population
m.06h0pr4
book.written_work.author
m.07r3d
thomas robert malthus