Aids to the mathematics of hygiene / [Robert Bruce Ferguson].
- Ferguson, R. Bruce (Robert Bruce)
- Date:
- 1904
Licence: In copyright
Credit: Aids to the mathematics of hygiene / [Robert Bruce Ferguson]. Source: Wellcome Collection.
74/112 (page 62)
Licence: In copyright
Credit: Aids to the mathematics of hygiene / [Robert Bruce Ferguson]. Source: Wellcome Collection.