The fourteenth data release of the sloan digital sky survey: First spectroscopic data from the extended baryon oscillation spectroscopic survey and from the second phase of the apache point observatory galactic evolution experiment - Abolfathi, Bela; Aguado, D S; Aguilar, Gabriela; Prieto, Carlos Allende; Almeida, Andres; Ananna, Tonima Tasnim; Anders, Friedrich; Anderson, Scott F; Andrews, Brett H; Anguiano, Borja; Aragon-Salamanca, Alfonso; Argudo-Fernandez, Maria; et al. (Astrophysical Journal Supplement Series, 2018)