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201. Oswald T. Avery, Christmas

203. Fred Griffith

204. Oswald T. Avery

205. Fred Griffith and "Bobby"

207. Colin M. MacLeod

209. Maclyn McCarty

210. Pneumococcus

211. Pneumococcus colony

214. Oswald T. Avery

215. Avery with Alvin Coburn's son, Tim

216. Colin M. MacLeod

219. Titration of Activity of Extracts 1/40, 2/40, 3/40

223. Avery's medals (back view)

224. Oswald T. Avery

225. Oswald T. Avery postcard

227. Oswald T. Avery

228. Oswald T. Avery

229. Roy C. Avery

230. Alphonse R. Dochez

231. Alphonse R. Dochez

232. Colin M. MacLeod

233. Maclyn McCarty

236. Desoxy--Saline Extract of Heated Type III Cells

239. O.T. Avery, Hoagland Laboratory, 1907-13

240. Oswald T. Avery

241. Dr. O. T. Avery--Deer Isle, Maine

242. Dr. O. T. Avery (in lounge chair)

243. O. T. Avery, Rockefeller Institute

244. Avery during the First World War

247. Army Epidemiological Board

248. Army Epidemiological Board

250. Army Epidemiological Board