This collection contains financial statements, annual reports, organizational charts, ledgers and other financial books, minutes, papers associated with the general running of Texas Eastern. This sub-subseries covers the years 1947 to 1988.

Executive records contains business papers of some Texas Eastern executives, including correspondence, memos, and reports. Topics include areas of strategic planning, management discussions of corporate divisions, legal matters, financial concerns, personnel matters, and mundane topics such as pipeline coatings and use of company cars. The sub-subseries also contains information about the untimely death of R.H. Hargrove, the first president of TETCO. The years covered are from 1948 to 1968.

The research and development sub-subseries contains primarily clippings from technical journals but also correspondence on topics ranging from new welding techniques to using pipelines as an alternative method of public transportation. The years covered are 1950 to 1972.

The Marketing, Sales sub-subseries contains news releases, photos, press clippings, documentation of press tours, Texas Eastern publications for internal and external audiences, stockholder surveys and other types of reports. The years covered are 1943 to 1989.

This sub-subseries covers the years 1969 to 1980, when Texas Eastern joined numerous other energy companies in harvesting the rich oil and gas fields in Alaska above the Arctic Circle. Subjects in Alaskan and Arctic Gas include news clippings, photos, technical papers, correspondence, business planning, environmental engineering, pipeline construction in Arctic conditions, and test facilities

Growth and Regulation is concerned with Texas Eastern's rapid growth and the regulatory fight that ensued. Some of the topics covered include the battle to gain right-of-ways for coal slurry pipelines, and foreign ventures in areas such as the North Sea, the Soviet Union and Algeria. This sub-subseries also contains records regarding the move of corporate headquarters from Shreveport Louisiana to Houston, Texas, development of the Houston Center and the George R. Brown convention center in downtown Houston. Other topics include court cases and bills before the U.S. legislature. The years covered are 1953 to 1983.

The Inch Lines sub-subseries focuses on the early history of the Big Inch and the Little Big Inch, the two pipelines created during WWII and the backbone for Texas Eastern gas-delivery system. This sub-subseries covers the years from the 1943 to 1994.

The first segment of documents contained in the Inch Lines sub-subseries comes from the papers of J. Ross Gamble, a Washington attorney in the firm of Leighton and Gamble. He played a key role in the acquisition of the Inch Lines by the individuals who would later form Texas Eastern Transmission Corporation. His papers were maintained as a distinct group within the Texas Eastern records. The Gamble papers cover the early years of Texas Eastern including the acquisition of the Inch lines and the formative years of TETCO from 1945 to 1949.

The Inch Lines sub-subseries also contains papers associated with the Cultural Resource Group of Louis & Associates, Inc. with offices in East Orange, New Jersey. The Berger group conducted research on the War Emergeny Pipeline (WEP) and completed the project about 2001. The Berger papers contains reports, news articles, journal excerpts, histories, and copies of photographs about the WEP. Most of the materials in the Berger sub-subseries are facsimile copies of originals.

The final section of the Inch Lines sub-subseries consists of correspondence, memos, reports, and photos dealing with federal agencies, such as the WEP, the War Assets Administration and the Federal Power Commission. This group also includes information about the Inch Lines, including major Inch Line events, such as the dedication in the 1940s, Texas Eastern's purchase of the lines, and the reconversion of the Inch Lines.

Texas Eastern sponsored and funded a history project that resulted in the book , published in 1993 and written by Christopher Castaneda and Joseph Pratt, both historians from the University of Houston.

Included in this sub-subseries are transcripts of interviews with Texas Eastern retirees and current employees. Most of these interviews were conducted in the 1980s and 1990s by the historians. This sub-subseries also contains the historians' notes, rough drafts of the book, galley proofs, graphic elements, some original documents related to Texas Eastern's history, news clips, maps of pipeline systems and other records of signicance.

The Texas Eastern photo collection documents the corporate life of Texas Eastern and the lives of its workers.This photo collection offers images of pipeline construction, routine operations, mug shots of staff, portraits of executives and board members, and photos of workers featured in the Texas Eastern internal publications. The collection images ranges from industrial or corporate shots, including images such as welders working in deep mud or secretaries typing letters, to employees working on hobbies, playing sports or attending company picnics. The bulk of the photos are from the 1950s to the 1960s with the entire collection spanning the years from 1947 to the 1980s.

The photos are organized in the same manner in which they were originally stored. Original file numbering has been incorporated into the folder titles. The collection processor preserved segments of the original envelopes containing useful information or containing handwriting that was not legible. Most of the photographs have been inventoried on an item level.