HST grism confirmation of 16 structures at 1.4 < z < 2.8 from the Clusters Around Radio-Loud AGN (CARLA) survey by Noirot, G, Stern, D, Mei, S, Wylezalek, D, Cooke, EA, De Breuck, C, Galametz, A, Hatch, NA, Vernet, J, Brodwin, M, Eisenhardt, P, Gonzalez, AH, Jarvis, M, Rettura, A, Seymour, N, Stanford, SA