Biofilm reactors, 2011 (Water Environment Federation)
Environmental anaerobic technology: applications and new development by Herbert H. P. Fang, 2010.
Beginning Google sketchup for 3D printing, 2010. [This book "starts by explaining how to use SketchUp and its plug-in to make your design products". The free version is available for download at http://sketchup.google.com (accessed August 2011).]