This grouping consists of materials from the various national and international gatherings the NAD was involved in. Of particular interest are materials from the numerous world congresses. The Seventh World Congress of the World Federation of the Deaf was the first international congress outside of Europe and hosted in the US by the NAD in 1975. Therefore, there are many documents pertaining to the event and its preparation in this series.

Series three includes correspondence between the National Association of the Deaf and national organizations, international organizations, schools, interoffice communications, and individuals from around the US. A very large portion of this series is dedicated to letters received and sent to persons in the United States concerned with matters of equality for the deaf that the NAD could possibly assist with. These letters are organized by the state from which they were received or sent to.