Over 400 inter-field professionals are named as environmental consultants in this 1972 annual directory. Primarily, they are faculty members at colleges and universities in Canada, Puerto Rico, and the United States who will provide free environmental consulting services to interested government, industry, and citizen organizations, but are not able to become full-time consultants. They are able to review prepared reports, collect small amounts of additional data, and suggest weaknesses in present programs. Consultants are listed in over 50 categories including agriculture, atmospheric science, ecology, economics, engineering, geology, health, land use planning, limnology, oceanography, sociology, toxicology, and waste water management. Each entry specifies the consultant's name, business address, telephone number, area of expertise, and a brief resume of his education, primary research, teaching or professional experience, and publications. Indexes classify professionals by name, country or state, and university affiliation. (BL)