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. 2011 Dec 15;25(2):400–424. doi: 10.1093/shm/hkr162

Fig. 1.

Fig. 1

Abbeville Filter-passer. Photomicrograph by the NIMR microscopist, J. E. Barnard.

Source: NA FD1/529 Bowman to Fletcher, 11 February 1919.