I am a Masters student taking a module in epistemology, and this book is the only required text, which is testament to its usefulness. It contains a full range of essays including classics (such as Gettier's on justified true belief, and Stroud's on Descartes' scepticism) to texts that demonstrate the more recent development of, and current thinking on, particular issues.
The book is divided into topical sections, and a short introduction to each section puts the essays into context, explaining their basic arguments and conclusions along with and their contribution to the wider literature on said topics. Bibliographies in each topic provide further avenues for investigation.
The sections, with each essay's author(s), are:
1) Scepticism (Stroud, Moore, Klein, Williams)
2) The Structure of Knowledge and Justification (Chisholm, Sellars, BonJour, Davidson, Haack, Sosa, Klein)
3) Defining Knowledge (Gettier, Harman, Zagzebski, Williamson)
4) Epistemic Closure (Dretske, Stine, Nozick, Sosa, Vogel)
5) Theories of Epistemic Justification (Feldman and Conee, Foley, Goldman, Vogel, BonJour, Goldman, Fumerton, Feldman and Conee)
6) Virtue Epistemology and the Value of Knowledge (Plantinga, Zagzebski, Greco, Pritchard, Sosa, Kvanvig, Elgin)
7) Naturalized Epistemology and the A Priori (Quine, Kim, Antony, Putnam, Casullo, Bealer; Weinberg, Nichols, and Stich; Kornblith
8) Knowledge and the Pragmatic (DeRose, Lewis, Cohen, Stanley, Fantl and McGrath, Hawthorne, MacFarlane)
9) Testimony, Memory, and Perception (Baker, Fricker, Burge, Lackey, Huemer, McDowell, Reynolds)
Such a wide-ranging text should be a first port of call for anyone thinking and learning about epistemology for the first time. It should also be a useful reference for research.
A link to a complete table of contents, listing the essays within the book, can be found above on the Amazon page.