This collection contains correspondence between Howard Lotsof and David Soloman. It documents Lotsof's work with ibogaine as well as other psychotropic drugs. The collection also contains and article on ibogaine that was suggested to Lotsof by Ralph Metzner along with an ibogaine bibliography from CIBA Pharmaceutical Company and a clipping concerning Lotsof's research.

The Marlene Dobkin de Rios papers documents De Rios' anthropological research on hallucinogens and contains correspondence, biographical clippings, papers, conference materials, and article reprint request cards.

This collection contains clinical evaluations and personal narratives documenting LSD sessions administered during The Maryland Psychiatric Research Center's professional training program.

A collection of seven audio cassettes distributed by Dolphin Tapes (Big Sur, California) containing Terence McKenna lectures and radio interviews recorded from 1981 to 1983.

This collection contains articles and publications collected by Ralph Metzner that explore different aspects of the progression of psychoactive substance research, including scientific research, politics, and religion.

The David E. Nichols papers contain biographical documents, correspondence, laboratory notes, scholarly manuscripts, grant applications, and other materials pertaining to the career of Purdue Medicinal Chemistry and Pharmacology Professor David E. Nichols.

The William Richards Collection on Walter Pahnke (1952-1972; 0.2 cubic feet) contains materials collected and donated by William Richards that document the life and work of his close colleague, Walter Pahnke. It includes some of Pahnke's important academic writings, copies of personal manuscripts, some biographical information, writings by his wife (Eva Sontum Pahnke), and materials memorializing his untimely passing.

The Psychoactive Substances Research Collection clipping files contain ) clippings and print-outs of online postings of relevance to psychoactive substances, psychoactive substances research, and those involved in this field of study.

This collection contains photocopies and reprints of published scholarly articles by those involved in psychoactive substances research.

The Rick Strassman papers (1989-1991; 1 folder) contains correspondence, a DMT Rating Scale questionnaire, and an article reprint.

The Thomas B. Roberts papers documents his research in psychoactive substances through articles, clippings, correspondence, conference materials, and a course syllabus.

The Charles Savage papers documents his professional and personal life focusing on his research concerning the therapeutic use of LSD and marijuana, his stay and research in West Africa, and his involvement with Spring Grove State Hospital, Maryland Psychiatric Research Center, and Friends of Psychiatric Research. The collection contains personal manuscripts, articles, grant applications, patient notes, and correspondence.

The David Solomon papers contain professional correspondence as well as information pertaining to psychological studies with psychotropic drugs. Solomon's correspondence with Robert Burdett and correspondence pertaining to "Flight to Reality" represents a large portion of the collection.

The collection consists of one folder which contains the title pages from some of Varro Tyler's published articles and theses. There is also a list of published works.

The Sanford Unger papers (1961-1974; 0.2 cubic feet) contains writings exploring the therapeutic potential of psychedelic substances. The collection also contains the correspondence between Aldous and Laura Huxley and Sanford Unger, and an excerpt from the 1966 CBS Reports feature, "LSD The Spring Grove Experiment."

The William Richards collection of Helen Bonny materials (1976-2010; 0.25 cubic feet) continas a photocopy of Bonny's PhD thesis, a photograph (1998), and a photocopy of her obituary.

The Leo Zeff papers contains photographs, reports, and correspondence that document Zeff's research on ibogaine.