I want to know the answer to the following question:
What does land has Federal Duck Stamp money helped purchase?
All the background I'm provided with is that "Since 1934, the sale of Federal Duck Stamps, a required purchase for migratory waterfowl hunters over sixteen years old, has raised over $700 million to help purchase more than 5,200,000 acres (8,100 sq mi; 21,000 km2) of habitat for the National Wildlife Refuge System lands that support waterfowl and many other wildlife species and are often open to hunting.". Is that enough to answer the question?