Categories
- Non Fiction > Mathematics & Science > Mathematics > Geometry > Trigonometry
- Non Fiction > Philosophy & Religion > Philosophy > Philosophical traditions and schools of thought > Western philosophy from c 1800 > Phenomenology and Existentialism
- Non Fiction > Mathematics & Science > Chemistry > Organic chemistry > Organometallic chemistry
- Non Fiction > Mind, body, spirit > Unexplained phenomena / the paranormal
- Non Fiction > Finance, Business & Management > Economics > Econometrics and economic statistics
- Non Fiction > Mathematics & Science > Science: general issues > Scientific nomenclature and classification
- Non Fiction > Philosophy & Religion > Religion and beliefs > Aspects of religion > Spirituality and religious experience > Miracles, apparitions and religious phenomena
- Non Fiction > Mind, body, spirit > Psychic powers and psychic phenomena