Resource engineering and technology for sustainable world :  VisualChallenge7 : "this is how see it" / 
Tony Grift. 
 - USA :  American Society of Agricultural and Biological Engineers,  Jan./Feb. 2018. 
 - 31 pages ;  28 cm. 
 -  V.25, No.1 .
<br/><br/> AE50 awards -- Ethics essay winner.