Campbell, F. A., Casement, R., & Grey of Fallodon, E. G. (1911). Letter from Francis A. Campbell to Roger Casement requesting he send Sir Edward Grey his observations on whether the post in Iquitos could be deemed as unhealthy.

Campbell, Francis A., et al. Letter from Francis A. Campbell to Roger Casement Requesting He Send Sir Edward Grey His Observations on Whether the Post in Iquitos Could Be Deemed as Unhealthy. 1911.