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181. Sudbury Department, Hopkinton Dam, depositing concrete in trench, southerly end, Ashland, Mass., 1890

182. Sudbury Department, Hopkinton Dam, from the north, with attendant's house in background, Ashland, Mass., Apr. 28, 1910

183. Sudbury Department, Hopkinton Dam, from the south, Ashland, Mass., Apr. 28, 1910

184. Sudbury Department, Hopkinton Dam, looking north, Ashland, Mass., 1892

185. Sudbury Department, Hopkinton Dam, looking north, Ashland, Mass., 1892

186. Sudbury Department, Hopkinton Dam, looking north, Ashland, Mass., 1892

187. Sudbury Department, Hopkinton Dam, northerly end, Ashland, Mass., 1891

188. Sudbury Department, Hopkinton Dam, southerly end looking north, Ashland, Mass., 1890

189. Sudbury Department, Hopkinton Dam, stripping base of dam site, northerly end, Ashland, Mass., 1890

190. Sudbury Department, Hopkinton Dam, trench and concrete mixer, Ashland, Mass., 1890

191. Sudbury Department, Hopkinton Dam, trench and core wall, southerly end, Ashland, Mass., 1890

192. Sudbury Department, Hopkinton Dam, trench and core wall, southerly end, Ashland, Mass., 1890

193. Sudbury Department, Hopkinton Dam, trench, Ashland, Mass., 1890

194. Sudbury Department, Hopkinton Dam, trench for 48-inch outlet pipe, Ashland, Mass., 1890

195. Sudbury Department, Hopkinton Dam, trench, northerly side hill, Ashland, Mass., 1891

196. Sudbury Department, Hopkinton Dam, trench showing bed rock and toe wall, Ashland, Mass., 1890

197. Sudbury Department, Hopkinton Dam, trench showing bed rock and toe wall, Ashland, Mass., 1890

198. Sudbury Department, Hopkinton Dam, trench showing bed rock, Ashland, Mass., 1890

199. Sudbury Department, Hopkinton Dam, trench, southerly end, Ashland, Mass., 1890

200. Sudbury Department, Hopkinton Dam, trench, southerly end, Ashland, Mass., 1890