1. Economics of a Domestic Approval Plan;Axford;College & Research Libraries,1971
2. On My Mind…Approval Plans — Viable?;Maddox;Journal of Academic Librarianship,1976
3. Approval Plans and Collection Development in Academic Libraries;Evans;Library Resources and Technical Services,1974
4. Book Collector's Market, a journal of the rare, out-If-pring, and antiquarian book trade, is an excellent source of information on dealers. Write Denis Carbonneau, P.O. Box 50, Cooper Station, New York, New York 10003.