When appropriate, cooperating associations will join the National Park Service in presenting interpretive and educational programs and in supporting research efforts. Enabled by a standard, non-negotiable cooperating association agreement, cooperating associations may purchase for re-sale, or produce for sale, interpretive and educational items that are directly related to the understanding and interpretation of the park or the National Park Service system. Associations may offer appropriate and approved interpretive services that support but do not supplant interpretive and educational services offered by the NPS. Associations may accept donations on behalf of the Park Service when appropriate, and when conducted through approved fund-raising efforts.