J. Walsh and EPA -Washington, DC, US,
“Process design manual : municipal sludge landfills”, vol. EPA/625/1-78/010. US Environmental Protection Agency (EPA), Washington, DC, USA, p. Various paging : tab. fig., 1978.
EPA -Cincinnati, OH, US,
“Sludge treatment and disposal: Volume 1. Sludge treatment”, vol. EPA/625/4-78/012. US Environmental Protection Agency (EPA), Cincinnati, OH, USA, p. viii + 140 p. : fig. tab., 1978.