Several anthologies offer interesting material about marijuana.
The best known is The Marihuana Papers (1966), edited by David Solomon. It includes Becker's "Becoming a Marihuana User," the 1944 La Guardia Report, and articles by William Burroughs, Timothy Leary, and Allen Ginsberg, among others. Erich Goode is the editor of a fine anthology entitled simply Marijuana (1969), which contains a number of useful articles and several good anonymous contributions. An excellent anonymous essay on marijuana called "The Effects of Marijuana on Consciousness" appears in an anthology by Charles Tart entitled Altered States of Consciousness (1969); this one chapter is more informative and original than many entire books about marijuana. An anthology edited by Norman Zinberg, Alternate States of Consciousness (1977), contains little on marijuana per se, but provides interesting views by Zinberg, Weil, Tart, and others on altered states of consciousness in general.Other anthologies of note include The Drug Experience (1961), edited by David Ebin, which contains first-person accounts of drug users, including material from the writings of Milton Mezzrow, Ludlow, Baudelaire, Bayard Taylor, and many others. The Book of Grass(1976), edited by George Andrews and Simon Vinkenoog, brings together a range of diverse materials on cannabis, including selections from the diary of George Washington, the caterpillar scene from Alice in Wonderland, and much more. The New Social Drug: Cultural, Medical and Legal Perspectives on Marijuana (1970), edited by David E. Smith, contains several important articles, including the full version of the classic Weil-Zinberg-Nelsen paper, "Clinical and Psychological Effects of Marihuana in Man."
Marijuana: Medical Papers, 1893-1972 (1973), edited by California physician Tod Mikuriya, is a compendium of articles on the medical uses of cannabis.
Hashish is the subject of several anthologies, including Tales of Hashish: A Literary Look at the Hashish Experience (1977), edited by David C. Kimmens, and a three-volume anthology of classic hashish tales edited by David Hoye, entitled Hasheesh: The Herb Dangerous (1974).
A useful reference work on drugs is the High Times Encyclopedia of Recreational Drugs (1978), which contains a strong section on cannabis by Michael Aldrich.
Finally, a fairly complete bibliography of items on the scientific aspects of marijuana is Marihuana: An Annotated Bibliography (1976), by Coy W. Waller, Jacqueline J. Johnson, Judy Buelke, and Carlton E. Turner.