Sentence:  In addition to <WSD>maintaining</WSD> a permanent central file of illustrations of diseases , wounds , and injuries of military importance , it provides facilities for clinical photography , photomicrography , and medical arts , and operates a printing plant , by permission of Congressional Committee , for publication of an `` Atlas of Tumor Pathology '' . 
Meaning of the word marked with <WSD> tags:  keep in a certain state, position, or activity; e.g., "keep clean"