Here's an historical American farm in action:

This is the Oliver H. Kelley Farm in Elk River, Minnesota.  It is a living history museum operated by the Minnesota National Historical Society.  It was designated a National Historic Landmark in 1964.  The sender of this card works with kids at a high school, and she said she had taken they had taken a recent field trip to this farm.  She told me they baked crackers, harvested turnips, and saw sheep in labor.  That sounds like very fun field trip to me!  

mnhs.org/places/sites/ohkf/aboutkelley.html
en.wikipedia.org/wiki/Oliver_H._Kelley_Homestead

This card arrived on July 16.