The Terry Hammonds Percheron and Conestoga Collection relates to Space Services, Inc. (SSI) and the 1981-1984 Percheron and Conestoga rocket programs. The collection is comprised of primarily of audiovisual materials, including photographs, slides, negatives, and audiocassettes, as well as a small amount of textual materials collected by Hammonds during his time reporting on SSI.

Series I, Audiovisual materials, comprises the bulk of the collection and includes six black-and-white 8x10 photographs, fifty-four color slides, and seventy-five negatives; all taken by Hammonds. The photographs, only two of which have captions providing contextual information, feature a snapshot of SSI founder, David Hannah and his wife, Catherine; the SSI Launch tower, two images of the Miss Matagorda, a transport barge, and one of its Captain [no name given] and one image of the Conestoga launch. The slides and negatives feature various Percheron and Conestoga scenes, such as the rockets being readied for launch, the launch tower, a bottle of champagne, close-ups of the logos on the rockets, and unidentified people. Duplication occurs.

There are also two audiocassettes; one is labeled "Perch[eron] SSI Houston" and, according to donor paperwork, is an interview with David Hannah following the Percheron explosion. The other is labeled "Hannah, Slayton 84" and includes interviews, likely conducted by Hammonds, with David Hannah and Deke Slayton.

Series II, Textual materials, includes two photocopies of magazine articles written by Hammonds; "Out of This World," Texas Business, December 1981, about Hannah and Space Services, Inc. and "Rocket Man,"Success: The Magazine for Achievers, July 1984, about Hannah’s mission to put private enterprise into space. Also included is a press kit folder and its materials; a color patch with "Conestoga" along the top and "Spaces Services Inc." along the bottom of a central image showing a partially obscured Earth and a conestoga wagon; an informational booklet on SSI, a Conestoga I Suborbital Test Launch booklet, and three documents related to the countdown summary, recycle criteria, and flight sequence of the Conestoga.