Freeman Bibliographical Database
| Identifier: | A3931 |
| Date: | 1881 |
| Concise reference: | Darwin, George Howard and Darwin, Horace. 1881. On an instrument for detecting and measuring small changes in the direction of the force of gravity. British Association for the Advancement of Science, report : [1-32]. CUL-Add9368.3.277 [Darwin Pamphlet Collection] |