Ellis Mount 
Weeding of Collections in Sci-Tech Libraries [PDF ebook] 

In this book, first published in 1986, experts from the various specialties describe the weeding process in corporate, academic, and university libraries. Factors affecting the weeding of materials — lack of space, a desire to place materials in a more suitable library, changing goals of the library — are explored. Discussions concerning the choices for the disposal of items are insightful and innovative.