GSL/COM/P/4/2/65 | Referees’ report: Johann Georg FORCHHAMMER, “Changes of level in Denmark” | 20 Oct 1837 | |
GSL/L/R/12/91 | Letter from Johan Georg FORCHHAMMER, Royal Society of Sciences, Copenhagen | 30 May 1851 | |
GSL/L/R/12/125 | Letter from Johan Georg FORCHHAMMER, Royal Society of Sciences, Copenhagen | 12 Oct 1851 | |
GSL/L/R/12/132 | Letter from Johan Georg FORCHHAMMER, Royal Society of Sciences, Copenhagen | 18 May 1852 | |
GSL/L/R/12/219 | Letter from Johan Georg FORCHHAMMER, Royal Society of Sciences, Copenhagen | 19 Mar 1853 | |
GSL/L/R/13/22 | Letter from Johan Georg FORCHHAMMER, Royal Society of Sciences, Copenhagen | | |
GSL/L/R/13/130 | Letter from Johan Georg FORCHHAMMER | 21 Dec 1853 | |
LDGSL/838/F/13 | Murchison correspondence: letters from Johann Georg FORCHHAMMER | 1837-1850 | |
LDGSL/838/F/13/1 | Murchison correspondence: letter from Johann Georg FORCHHAMMER | 17 May 1837 | 
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LDGSL/838/F/13/2 | Murchison correspondence: letter from Johann Georg FORCHHAMMER | 1 Mar 1845 | 
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