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Research topics that arise from the conceptualization of control for closed life support systems which are life support systems in which all or most of the mass is recycled are discussed. Modeling and control of uncertain and poorly defined systems, resource allocation in closed life support systems, and control structures or systems with delay and closure are emphasized.

The sixth annual supplement to the bibliography on planetary quarantine contains 191 references, an author index and a permuted title index.

A bibliography, which is a compilation of citations relating to planetary quarantine, previously listed in similar publications since 1967, is presented to provide a reference for reviewing planetary quarantine research and development.