As Leeneia has pointed out in a previous post, there are more than one set of chords that go with tunes like this, but here are the ones that I use. While Ken Ramsden and Michael Kettemer of Freshwater Trade use the same chords for the A part, I think they have a different set for the B part. I've sent them an email to see.

A: Am G Am /,...

B: C G F C, Am G F G, C G F C, Am G Am /