Here you can find lists of great Applied Math books are or have been used to teach courses at Harvard.
By: Stephen P. Bradley, Arnoldo C. Hax, Thomas L. Magnanti
By: Paul A. Jensen
By: Roman Vershynin
By: Terence Tao
By: Stephane Boucheron, Gabor Lugosi, Pascal Massart
By: Joseph Gallian