This collection contains material for Bill and Judy Guggenheim's research on after-death communication as part of the ADC Project along with the writing, publishing, and promotion of their book Hello From Heaven!, from approximately 1974 through 2022. It also includes their research and manuscripts for a possible sequel, noted as ADC Project Book 2, that was never published.

The collection is composed of audio cassettes of ADC Interviews, printed transcriptions of those interviews, manuscripts for Hello From Heaven!, ADC Project management documents, contracts and publicity material for the ADC Project and Hello From Heaven!, documents pertaining to unpublished Book 2, VHS tapes of publicity and interviews for Hello From Heaven!, and various other documents gathered by Bill Guggenheim.