The Administrative Files series contains records pertaining to the business operations of Development and Resources Corporation (D). The majority of the series is composed of the files of several officers of D, including John G. Burnett, Gerald M. Levin, David E. Lilienthal, John Oliver, and Jonathan L. Swift. The officer files contain correspondence, memoranda, and reports about managing D and its projects, including negotiating the language of contracts, finances and personnel, project progress updates to the country governments, and materials documenting the perception of D in the media. Lilienthal's files are largely composed of his memoranda on the purpose of D, as well as monthly status reports on the company's finances and performance and discussions of future D leadership. The series also includes records of several D offices, predominantly in Bangkok and Saigon. The records include financial reports, information on current and potential projects in the region, reports on conditions in their country, and correspondence on the coordination of project staff, the arrival of D officers, and writing reports to the country governments. Additionally, the series includes correspondence, policy and financial records, and topical files about several countries and similar projects conducted by other organizations.

The Project Files series is composed of records related to D's development projects, which include water management and irrigation studies, the construction of dams, the development of river basins, agricultural development, and general economic development. The projects were located throughout the world, largely in Latin America, Africa, and the United States, as well as a few projects in the Middle East, Southeast Asia, and Europe. D's work in Colombia and Vietnam are best documented. The records include correspondence, proposals and reports, collected materials about the countries, contracts, data and maps, and publicity materials.

The Khuzestan Development Project (Iran) series contains the records pertaining to D's development work in the Khuzestan Region of Iran from 1956 to 1979, as well as a small number of projects that extended into the rest of the country. The records predominately document D's construction of the Dez Dam and related work with irrigation and agriculture, and also include correspondence files and other records pertaining to the management of the region's development. Please see the subseries descriptions in the contents list for additional information about individual subseries.

These records document Medina's writings about law, religion, politics and literature. This series includes introductions to others' books, book reviews, and the texts of articles, speeches and memorials authored by Medina. Information about when and where Judge Medina gave these speeches can be found in the correspondence series.

The correspondence in this series includes discussion of both personal and professional matters.

These scrapbooks include press clippings, texts of speeches, correspondence, awards, and miscellaneous records of Judge Medina's life and career.

These records document Harold Medina's work as a law professor and with the "Medina Course," an independent venture to help students study for the New York bar. Records include notes (mostly from current events in the world of jurisprudence), some financial records, correspondence, and copies of bar exams.

Medina had the work he had done as an attorney bound into volumes. These volumes are listed by number, and include a list of the major cases contained within.