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Specialists working on the development and use of phosphate rocks contributed chapters to this publication. Their contributions are greatly appreciated and highly acknowledged.

In addition to writing individual assigned chapters, most of the contributors also reviewed chapters written by other contributors. Thanks are due to all of them for their efforts in peer reviewing the document.

Special thanks are due to R.N. Roy and F. Zapata for the conceptualization, initiation, technical guidance, inputs, reviewing and editing of this publication. Thanks are also extended to R.V. Misra and I. Verbeke for their inputs in finalizing this document.

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