Research needs in mineral processing (Report of a workshop held at Arden House, Columbia University, New York, N.Y., August 1–3, 1975.): P. Somasundaran and D.W. Fuerstenau (Chairmen). Sponsored by “National Science Foundation, Energy related general research office and Division of Engineering — solid and particulate processing. Final report for Grant No: ENG-75-09322. Principal Investigator: P. Somasundaran, Columbia University, New York, USA