Earthenware crock buried and set as survey marker by Ferdinand Hassler at Station Willow Grove 1839. The fact that it could be found and recovered is a tribute to the accuracy of the work of Hassler and his descendant surveyors of the Coast and Geodetic Survey.
Photo Category: Coast and Geodetic Survey
Photo Location: Pennsylvania, Willow Grove
Photo Date: 1979
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| 1280 x 837 | 114.34 KB | |
| 1920 x 1255 | 271.00 KB | |
| 2975 x 1944 | 706.10 KB | 
| Added On | 16th October 2015 | 
| Viewed | 10 viewed |