Delia Graff & Timothy Williamson 
Vagueness [PDF ebook] 

Vagueness, volume XX, contains twenty-seven essays, with issues covered including: nihilism, phenomenal sorites, degrees of truth, epistemicism, higher-order vagueness, contextualism, and intuitionism. Written by leading contemporary philosophers, these essays will be of interest to researchers in philosophy of language, philosophical logic, metaphysics and epistemology; as well as those in natural language semantics, artificial intelligence and cognitive science more generally. A substantial introduction written by the editors provides a guide to the topic and to the essays in the volume.