GSL/L/R/11/304
Letter from Evan HOPKINS
23 Jan 1851
GSL/L/R/13/132
26 May 1854
GSL/L/R/14/49
6 Feb 1857
LDGSL/158
'An east and west section of the Primary Series as developed in New Granada'
1850
LDGSL/171
'Section showing the general characters of the gold-bearing rocks with their superficial detritus...
1853