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: 1999 P American Silver Eagle Proof $1 PF69 UCAM - Jones Signed NGC
Product feature: 1999-P American Silver Eagle Proof, NGC PF69, Actual Silver Weight: 1 Troy oz, Signed by Elizabeth Jones
Target attributes: Type
Answer: attribute: type
value: proof
source: product title
attribute: type
value: silver
source: product title
attribute: type
value: silver
source: product feature