Have a look back on Ag Shows of the past. Perhaps you'll recognize yourself or someone you know winning big or showing off poultry or successfully guiding a horse over a jump: There's so much to take in in these old snapshots but they also showcase how little the annual exhibition has changed over the years.   [caption id="attachment_16505" align="aligncenter" width="600"] Thirteen-year-old Diana Mulder takes a fall from Lucy. She was unhurt. June, 1969.[/caption]   [caption id="attachment_16504" align="aligncenter" width="600"] The…