Institutional Membership:

Institutional membership is another potential resource in collecting documents. The library may enlist itself as member of learned societies and institutions who publish useful materials. Often the membership subscription may cover the right to receive their publications either free of cost or at concessional prices. 

Deposit System:

The deposit system entitles some specially designated libraries to receive free copies of the publications brought out by governments, national and international organisations, etc. There are many university libraries and state central libraries enjoying these benefits. There are also the national and state legal libraries designated to receive free copies of all publications originated in India, either under the provisions of the Copyright Act or the Delivery of Books and Newspapers (Public Libraries) Act, 1956. In all these cases the recipient library should be continuously on the alert about the new titles and their timely receipt.