ADI established the Auxiliary Publication Program, which during its 30-year history released nearly 10,000 documents covering a wide range of subjects. The program enabled authors in the fields of physical, natural, social, historical and information sciences to publish and distribute research papers that were either too long, typographically complex or expensive to be published in journals using existing technology. In 1954, the Photoduplication Service at the Library of Congress took over the operation and became the source point for distributing ADI materials and in 2009 this material found its home in the Library's Technical Reports and Standards Unit.