Sentence:  ... the unfortunate reality for much of the developing world has been that a combination of <WSD>book dumping</WSD>, poverty and underfunding of libraries has severely limited the ability of librarians to collect relevant, high-quality resources (Sturges, 2014; Edem, 2010; Otike, 1993). 
Meaning of the word marked with <WSD> tags:  The practice of donating old used books that burden rather than assist communities.