Sentence:  In addition to the interlibrary loan service and the children 's program , headquarters has a public relations director who seeks to get wider grassroots support for quality library service in the county ; it prepares cooperative displays ( posters , booklists , brochures , and other promotional material ) for use in member libraries ; it <WSD>maintains</WSD> a central exhibit collection to share displays already created and used ; and it publishes Sum and Substance , a monthly newsletter , which reports the system 's activities to the staffs and trustees of member libraries . 
Meaning of the word marked with <WSD> tags:  keep in safety and protect from harm, decay, loss, or destruction