MORTKHE KAPLAN (b. 1881)
He was publisher, born in Sernik (Serniki), near Pinsk. In 1908 he founded in Warsaw the publisher Hashaḥar (The dawn), which brought out books in Yiddish by Mortkhe Spektor, Zalmen Shneur, Rokhl Faygenberg, D. Pinski, and a collection entitled Shvalben (Swallows) in 1919 (30 pp.). In 1910 he merged with the publisher Progres (Progress) of Yankev Lidski. He later initiated the publishing syndicate Tsentral (Central) and in 1926 was one of the founders of the cooperative Bikher (Books).
Source: Zalmen Reyzen, Leksikon, vol. 3.