1. Amelinckx, S, van Dyck, D, van Landuyt, J and van Tendeloo, G (Eds.) 1997 Electron Microscopy: Principles and Fundamentals VCH Weinheim Germany. An expensive text containing review articles by leading microscopists covering TEM and much more. A good overview to put TEM in context, but make sure your library buys this along with the even more expensive Handbook of Microscopy: Applications in Materials Science, Solid State Physics and Chemistry edited by the same authors and published by VCH in 1997.
2. DeGraef, M 2003 Introduction to Conventional Transmission Microscopy Cambridge University Press New York. A complementary text to this one, in many ways. It uses different materials specimens as a thread to introduce different techniques. Supported by an excellent Web site ( http://ctem.web.cmu.edu/ ) but not really an introduction!
3. Edington, JW 1976 Practical Electron Microscopy in Materials Science Van Nostrand-Reinhold New York. The original out-of-print 1976 edition has been reprinted by TechBooks, 2600 Seskey Glen Court, Herndon, VA 22071. A very helpful, if outdated, text full of examples and hands-on operations; no AEM or HREM, just diffraction-based imaging.
4. Egerton, RF 2006 Physical Principles of Electron Microscopy; An Introduction to TEM, SEM, and AEM Springer New York. If you need a general introduction to EM, this is a good choice.
5. Ernst, F and Rühle, M (Eds.) 2003 High-Resolution Imaging and Spectrometry of Materials Springer Series in Materials Science 50 Springer Berlin. A collection of review articles covering some aspects of TEM and other high-resolution techniques.