Great Common Mistakes Rowing PDF

As long as we're on the subject of rowing, I just found this terrific PDF (1.7MB) on correcting common technique mistakes: Common Mistakes in Rowers' Techniques and Remedies Therefore. The diagrams assume you're in a boat rather than on an erg, but all the info still applies (except perhaps some of the oar technique stuff). At least, I think it still applies, but keep in mind I know nothing about rowing.