Tihkal (http://www.erowid.org/library/books_online/tihkal/tihkal.shtml)
(http://www.erowid.org/library/books_online/tihkal/tihkal.shtml)
Jonathan Ott's masterpiece Pharmacotheon contains a very interesting passage about ppl who claim to have used mescaline, while they probably have been tripping on LSD.
Where I live microdot LSD is still being sold as 'mescaline' or 'peyote extract'.