1909. 23. Изделия акционерного общества чулочно-вязальных изделий Керстен В. П. и фирмы Лаубе А., 1909
Russian-swedish exhibition of physical development and sports (opened on august 16, 1909 in the mikhailovsky manege). 1909. 23. Products of the joint-stock company of hosiery and knitting products kersten v. P. And the company laube a. Jpg. Date: 1909.