Francisco C. Picón's Spanish-language online journal Diario de Ciencias Psíquicas contains an artice on Charlie Dunbar Broad (1887-1971). Broad was a philospher and prominent member of the SPR, serving as its president in 1935-1936 and 1958-1960. The journal can be found here:
http://survivalafterdeath.blogspot.co.uk/2017/03/diario-de-ciencias-psiquicas-n2-abril.html