(1) A History of the Theory of Investment.
(2) Capital Ideas Evolving.
(3) Just in case you like to read more stuff by Jeff Sachs on development, get this.
(4) For those who are interested in antitrust, this probably is indispensable.
(5) Want to have fun with basic introductory economics? Get this then. John Lott was a student of Armen Alchian at UCLA. For those who are not familiar with John's work, John has written an excellent book some time ago on why theories of predatory pricing are not supported by facts, get it here.