Daniels, W.L., B.R. Stewart, and C. E. Zipper. 2018. Reclamation of coal refuse disposal areas. Va. Coop. Ext. Pub. 460-131. Virginia Tech, Blacksburg, VA. https://powell735837127.files.wordpress.com/2020/06/460-131-1.pdf
Daniels, W.L., and C.E. Zipper. 2018. Creation and management of productive mine soils. Powell River Project/Va. Coop. Ext. Pub. 460-121. Virginia Tech, Blacksburg, VA. https://www.pubs.ext.vt.edu/460/460-121/460-121.html
Daniels, W.L, B.R. Stewart, K.C. Haering, and C.E. Zipper. 2002. The potential for beneficial reuse of coal fly ash in southwest Virginia mining environments. Powell River Project/Va. Coop. Ext. Serv. Pub. 460-134. Virginia Tech, Blacksburg, VA. https://powell735837127.files.wordpress.com/2020/04/460-134.pdf
Atkinson, R., C. Zipper, W.L. Daniels and J. Cairns, Jr. 1997. Constructing wetlands during reclamation to improve wildlife habitat. Va. Coop. Ext. Pub. 460-129. Virginia Tech, Blacksburg, VA. https://powell735837127.files.wordpress.com/2020/07/460-129.pdf
Evanylo, G.K., and W.L. Daniels. 1996. Papermill sludge enhances the quality of agricultural soils. Crop and Soil Environmental News, Feb. 1996. Virginia Cooperative Extension Service, Virginia Tech, Blacksburg, VA. https://www.researchgate.net/publication/338698837_Papermill_sludge_enhances_the_quality_of_agricultural_soils