A collection of good LSD reference books:

Acid dreams: the complete social history of LSD : the CIA, the sixties, and LSD By Martin A. Lee, Bruce Shlain
Acid Dreams is the complete social history of LSD and the counterculture it helped to define in the sixties. Martin Lee and Bruce Shlain’s exhaustively researched and astonishing account — part of it gleaned from secret government files — tells how the CIA became obsessed with LSD as an espionage weapon during the early 1950s and launched a massive covert research program, in which countless unwitting citizens were used as guinea pigs. Though the CIA was intent on keeping the drug to itself, it ultimately couldn’t prevent it from spreading into the popular culture; here LSD had a profound impact and helped spawn a political and social upheaval that changed the face of America. From the clandestine operations of the government to the escapades of Timothy Leary, Abbie Hoffman, Ken Kesey and his Merry Pranksters, Allen Ginsberg, and many others, Acid Dreams provides an important and entertaining account that goes to the heart of a turbulent period in our history. Book jacket.

LSD, spirituality, and the creative process By Marlene Dobkin de Rios, Oscar Janiger
In 1954 a Los Angeles psychiatrist began experimenting with a then new chemical discovery known as LSD-25. Over an eight-year period Dr. Oscar Janiger gave LSD-25 to more than 950 men and women, ranging in age from 18 to 81 and coming from all walks of life. The data collected by the author during those trials and from follow-up studies done 40 years later is now available here for the first time, along with the authors’ examination of LSD’s ramifications on creativity, imagination, and spirituality. In this book Marlene Dobkin de Rios, a medical anthropologist who has studied the use of hallucinogens in tribal and third world societies, considers the spiritual implications of these findings in comparison with indigenous groups that employ psychoactive substances in their religious ceremonies. The book also examines the nature of the creative process as influenced by psychedelics and provides artwork and poetry from the original experiment sessions, allowing the reader to personally witness LSD’s impact on creativity. The studies recounted in LSD, Spirituality, and the Creative Process depict an important moment in the history of consciousness and reveal the psychic unity of humanity.

Psychedelics encyclopedia By Peter G. Stafford, Jeremy Bigwood
Traces the history of the use of hallucinogenic drugs and discusses the psychological and physical effects of LSD, marijuana, mescaline, and other drugsTraces the history of the use of hallucinogenic drugs and discusses the psychological and physical effects of LSD, marijuana, mescaline, and other drugs.

The adventure of self-discovery By Stanislav Grof
Presents a useful model of the psyche for understanding such phenomena as shamanism, mysticism, psychedelic states, spontaneous visionary experiences, and psychotic episodes.

50 years of LSD: current status and perspectives of hallucinogens : By Alfred Pletscher
The three primary scales, which are positively correlated, are parts of the secondary scale. The first subscale is designated as “Ozeanische Selbstentgrenzung” (OSE) (“oceanic boundlessness”). The scale contains 13 items and describes a state similar to mystical experiences, according to the scientific literature in this subject. The second subscale: Angstvolle Ichaufl`sung (AIA) (“dread of ego dissolution”) is operationally defined by 22 items which indicate a very unpleasant state, similar to what is called a “bad trip” by drug-users. The third primary scale is termed Visionre Umstrukturierung (VUS) (“visionary restructuralization”) and includes the 14 items. It includes items on visual (pseudo)-hallucinations or visions, illusions and synesthesias.