More than 150 Chinese government and business leaders from Iowa's sister state of Hebei are visiting Des Moines today and Tuesday. During a ceremony scheduled tomorrow at Principal Financial Group Inc., Gov. Terry Branstad and Chinese leaders will sign letters of intent in the areas of trade, agriculture, tourism and education valued at more than $1 billion. The delegation is visiting Iowa in celebration of the 30th anniversary of Hebei's sister state relationship with Iowa. China is Iowa's fourth-largest trading partner. In 2012, Iowa's manufactured and value-added goods exports to China were valued at $751 million. See a full list of agreements here.