National Geographic : 1956 Feb
>A a 4 : 275 Rock Walls Crisscrossing Penghu Fields Shield Crops from Wind-borne Salt Spray Gales blow in off the sea more than 200 days a year. Only a few crops, such as the hardy sweet potato, can grow in the open. Some coral walls rise as high as 10 feet. Here a farm wife hauls irrigation water.