00288nam a22000977a 450000500170000008200190001710000210003624500810005726000440013830000080018220250911122011.0  a 639.89 SKI.N3  aSkillicorn, Paul  aDuckweed aquaculture: a new aquatic farming system for developing countries   a Washington, D.C:b World Bank,c 1993.  a76.