摘要：Conduct of the Exchange in regard to material offered and its assignment, see Revised Constitution and By-Laws, Article 4, Chapter 1-4 inclusive. Duplicate Offered. Please keep on file all duplicate material offered through the Exchange until assignments are sent in (usually six weeks after publication). Material will be published as soon after it is received as possible, subject to conditions at Headquarters and the need for removal of material by the library offering it. The list need not be long, unless there is urgent need for a general clearing of material. Checking. In checking lists, please write your wants on a separate sheet and return to Headquarters. It is then not necessary to return the original Exchange list. Please return checkings within a month after receipt of list. This will help the manager greatly, and as a result all lists should be in the hands of libraries for distribution six weeks after publication.
