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161. Demonstration plots at Princeton Farms Demonstration plots at Princeton Farms Sweet clover; Fertilizers; Experiments; Indiana Late July 1955 - Demonstration plots at Princeton Farms after harvest - showing effects of heavy rates of nitrogen on Clover.
162. Demonstration plots at Princeton Farms Demonstration plots at Princeton Farms Sweet clover; Fertilizers; Experiments; Indiana Late July 1955 - Demonstration plots at Princeton Farms after harvest - showing effects of heavy rates of nitrogen on Clover.
163. Demonstration plots at Princeton Farms Demonstration plots at Princeton Farms Sweet clover; Fertilizers; Experiments; Indiana Late July 1955 - Demonstration plots at Princeton Farms after harvest - showing effects of heavy rates of nitrogen on Clover.
164. Demonstration plots at Princeton Farms Demonstration plots at Princeton Farms Sweet clover; Fertilizers; Experiments; Indiana Late July 1955 - Demonstration plots at Princeton Farms after harvest - showing effects of heavy rates of nitrogen on Clover.
165. Students surveying in forest Students surveying in forest Surveying; Surveying equipment;Purdue University--Students College of Civil Camp. Group in forest
166. Students surveying in field Students surveying in field Surveying; Surveying equipment;Purdue University--Students College of Civil Camp. Men surveying
167. Students surveying in field Students surveying in field Surveying; Surveying equipment;Purdue University--Students College of Civil Camp. Men surveying
168. Man surveying in field Man surveying in field Surveying; Surveying equipment;Purdue University College of Civil Camp. Man surveying
169. Students surveying in forest Students surveying in forest Surveying; Surveying equipment;Forests;Purdue University--Students College of Civil Camp. Route Surveying
170. Students surveying in field Students surveying in field Surveying;Rivers;Dogs;Boats;Purdue University--Students College of Civil.
171. Students surveying in field Students surveying in field Surveying;Purdue University--Students;Students College of Civil. Making measurements outside
172. Students surveying in field Students surveying in field Surveying;Purdue University--Students College of Civil. Group in forest surveying
173. Students surveying in field Students surveying in field Surveying;Purdue University--Students College of Civil. Group surveying
174. Men working near river Men working near river Surveying;Purdue University--Students College of Civil. Men outside
175. Students surveying in forest Students surveying in forest Surveying;Forests;Purdue University--Students College of Civil. Making measurements outside
176. Men surveying in field Men surveying in field Surveying; School of Engineering - sighting in field
177. Students in workshop Students in workshop Students; Workshops; Laboratories; Engineering - Classes and Laboratories.
178. Students working in laboratory Students working in laboratory Students; Workshops; Laboratories; Engineering - Classes and Laboratories.
179. Student operating experimental machine Student operating experimental machine Students; Workshops; Experiments; Engineering - Classes and Laboratories. Experimental punch press with stress - strain indicator operated by John T. McFarland, Student
180. Students in workshop Students in workshop Students; Workshops; Engineering - Classes and Laboratories. A shop class
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results 161-180 of 2495 item(s)  page 9 of 125 : ( <<  1  2  3  4  5  6  7  8  9  10  >> ) :: previous : next