The importance and intricacy of the solid wastes disposal problem and the need to deal with it effectively and economically led to the state-of-the-art survey covered by this report. The report is divided into two major parts: Unit Operations and Processes and Major Waste Categories. The first part of the report is divided into six sections: Densification and Size Reduction, Separation, Sanitary Landfill and Open Dumping, Incineration, Chemical Processing, and Recovery and Utilization. This first part of the report also includes various regulations concerning solid waste disposal, discussion being based on responses to the questionnaires sent to the State health departments. The second part of the report, arranged alphabetically, covers all the major waste categories considered. The report concludes with a bibliography.