TY - RPRT TI - Conceptual design of a closed loop nutrient solution delivery system for CELSS implementation in a micro-gravity environment AU - Schwartzkopf, Steven H. AU - Oleson, Mel W. AU - Cullingford, Hatice S. PY - 1990 UR - https://ntrs.nasa.gov/citations/19910022484 ID - 19910022484 ER -