
Photograph of monitors washing gravel face with bedrock drain in foreground on American Hill No.18 Below Discovery Bonanza Creek
Inscription recto: Hydraulic Method of Washing Gravel on American Hill, Photo by J. Doody, Dawson
Photograph of monitors washing gravel face with bedrock drain in foreground on American Hill No.18 Below Discovery Bonanza Creek
Inscription recto: Hydraulic Method of Washing Gravel on American Hill, Photo by J. Doody, Dawson