Later in life, Mr. Lankenau worked with Dr. Ben Bahan of Gallaudet and the Gallaudet Archives on a project to collect texts of speeches by prominent members of the deaf community. Most of this series consists of letters and e-mails from Mr. Lankenau to those chosen for this project, as well as some contact lists and notes.

Mr. Lankenau also assisted Dr. Jack R. Gannon in compiling information for his history of the World Federation of the Deaf. This series is mostly correspondence between Mr. Lankenau and various groups affiliated with the WFD, requesting details on their history and activities.