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Northwestern mutual life. A century of trusteeship
Williamson, Harold Francis, (1957)
Life insurance
Huebner, S. S., (1958)
Modern Life Insurance : A textbook of income insurance. Robert I[rwin] Mehr, Robert W[illard] Osler
Mehr, Robert Irwin, (1956)
On the economy of machinery and manufactures
Babbage, Charles, (1835)
Babbage, Charles, (1832)
William Whewell (1794 - 1866), Dionysius Lardner (1793 - 1859), Charles Babbage (1792 - 1871)
Blaug, Mark, (1991)