The letter discusses the eligibility criteria for enrollment in the Delaware Distribution Act of 1968 for descendants of the Delaware Nation. It emphasizes the need for proof of lineage to individuals who were part of the Delaware Nation as of 1818. The Department of the Interior is working to review and clarify the criteria for enrollment and will provide further guidance to the recipients of the letter once a satisfactory solution is reached. The letter also addresses the deadline for applications and appeals for enrollment under the Act.