यह Publication Issue अपनी भाषा में मौजूद नहीं है, में देखें: English (en),
या गूगल अनुवाद का उपयोग:  
हिन्दी भाषा (hi) | भाषा बदलें (Change Language)

After seeing several examples of Appropriate Technology as they toured ECHO-North America, students will play a card game to review the technologies, plot the location of each one on a farm map, and then design their own invention to assist small-scale framers.