L. A. Haas
D. M. Hopstock
A. F. Colombo
James Lewis Morrill
Ronald G. Worl
Minnesota. Legislature. Legislative Research Committee
Rolland Laws Blake
J. E. Pahlman
Janet Dailey
E. W. Davis
H. D. Jacobs
Edward W. Davis
Peterson, R. E.
Edward Wilson Davis
United States. Environmental Protection Agency. Office of Air Quality Planning and Standards. Air Quality Strategies and Standards Division