Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: 2014 No Mint Mark Silver Eagle $1 Silver Seller Uncirculated
Product feature: 1 Troy Ounce, 2014 Silver Eagle, .999 Fine Silver, ASE, $1 Silver Coin
Product price: $27.23
Target attributes: Nationality
Answer: attribute: nationality
value: None
source: None