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There are a lot of good chord diagram websites out there and I've used several myself. Here's a pretty good one I came across recently. http://app.tekartik.com/chords/ - maybe you'll find it useful....

A couple thoughts on comments re: this page - http://chordlist.brian-amberg.de/en/mandolin/standard/A7/ra.html

I think the author there is giving a good list of inversions, and I don't think he...

A cute thing you can do with 2 note 7th chords: x65x is an E7. Move it back towards th nut 1 fret and it's an A7. Move back another fret and it's a D7, then G7, and C7.
As far as hitting the chords...