Target Selection and Sample Characterization for the DESI LOW-Z Secondary Target Program - Darragh-Ford, E; Wu, JF; Mao, Y-Y; Wechsler, RH; Geha, M; Forero-Romero, JE; Hahn, C; Kallivayalil, N; Moustakas, J; Nadler, EO; Nowotka, M; Peek, JEG; et al. (ASTROPHYSICAL JOURNAL, 2023)