I have only played around a tiny bit with the GCC Modula 2 compiler but in general there are several versions based on different editions of Wirths book Programming in Modula 2 (PIM)

I think gcc m2 supports several versions of PIM but you have to tell it which one you use, so which book version you use, basically.

Also there are many Modula 2 examples in the Rosetta code project for common algorithm, if you want to try that. http://rosettacode.org/wiki/Category:Modula-2