Description: This book is the fourth in a series of four volumes and contains collected correspondence to and from Sam Houston. The letters include footnotes that give clarification and context. The volume also has an appendix, addenda, bibliography, and an index (which starts on page 523).

Description: This document is a technical Recommendation for use in developing a broader consensus on what is required for an archive to provide permanent, or indefinite long-term, preservation of digital information. This Recommendation establishes a common framework of terms and concepts which comprise an Open Archival information System (OAIS). It allows existing and future archives to be more meaningfully compared and contrasted. It provides a basis for further standardization within an archival context and it should promote greater vendor awareness of, and support of, archival requirements. Through the process of normal evolution, it is expected that expansion, deletion, or modification of this document may occur. This Recommendation is therefore subject to CCSDS document management and change control procedures which are defined in Procedures Manual for the Consultative Committee for Space Data Systems. Current versions of CCSDS documents are maintained at the CCSDS Web site: http://www.ccsds.org/