281. Mechanical Laboratory Collection: Images from the Rare Book and Manuscript Collections Format: Image
282. Geodetic Obseratory Collection: Images from the Rare Book and Manuscript Collections Format: Image
283. Estevan A. Fuertes Collection: Images from the Rare Book and Manuscript Collections Format: Image
284. Dynamo Laboratory Collection: Images from the Rare Book and Manuscript Collections Format: Image
286. Harris J. Ryan lecturing Collection: Images from the Rare Book and Manuscript Collections Format: Image
288. 400,000 test machine with Lev Zetlin Collection: Images from the Rare Book and Manuscript Collections Format: Image
289. Large pipe, six men Collection: Images from the Rare Book and Manuscript Collections Format: Image
290. Meeting place of the Social Study Club and , at a later period, of the Alpha Phi Alpha Fraternity Collection: Images from the Rare Book and Manuscript Collections Format: Image