Scans of Aven Nelson collecting field books. This section dates from 1897 and contains records 2851-3500. (This book actually appears to contain: 2851-2874, 2904-2949, 3146-3458, 4501-4509 (Elias Nelson); 3459-3500, 4144-4284 (Aven Nelson); 4285-4309 (W.C. Knight), (The inside front cover says Book 5a). [2875-2903 occupied by Pine Bluffs collection in A_Nelson_1897_2875-2903, etc.)] [2950-3145 occupied by the Western Collection in A_Nelson_1897_2875-2903, etc.].