Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons 'Please see enclosed P. C. [not enclosed][.] You will see that they say Dunsink Observatory has not received Proc. [Proceedings of the Royal Society] No. 433. Will you kindly look up whether this was duly sent, & when answering you might tell us what address you use. Perhaps you put Dublin only without Dunsink. RH'. 8 October 1900