From this web site
Introduction into TEM and STEM (download pdf-file).
Introduction into electrons, their interactions with matter and the signals utilized in electron microscopy (download pdf-file).
semi-automatic determination of particle size distributions
is possible with ImageJ
From external web sites
Alignment of TEM and STEM by J. Rodenburg (on-line Tutorials).
For a selection of recommended books and articles about electron microscopy, see literature.