If the photo source and footnotes were arranged into a citation entry, which note would come first? a. purvis, l. l. 2002. "civilian conservation corps company 818: building the colorado river trail." pages 81–85 in m. f. anderson, editor. a gathering of grand canyon historians: ideas, arguments, and first-person accounts. grand canyon association, grand canyon, arizona, usa. b. quinn, michael. photo courtesy of nps (national park service). c. hughes, d. j. 1978. in the house of stone and light: a human history of the grand canyon. grand canyon natural history association, grand canyon, arizona, usa. d. anderson, m. f. 2000. polishing the jewel: an administrative history of grand canyon national park. grand canyon association, grand canyon, arizona, usa.