Copy letter from Robert William Frederick Harrison to Messrs Friedlander & Sonn, Carletrasse 11, Berlin, NW 'Dear Sirs, On October 18th, 1907 we sent to your order 5 copies of part VII of the Sleeping Sickness Reports. These copies were not included in your statement of sales, accordingly, I send you a a/o at 15% discount. We reference to the stock of separate papers series A & B which hold on sale or return, I shall be much obliged if you will let me have at an early date, a complete list of the series remaining in your warehouse, unsold.' 11 March 1908