[Москва] : Управление Гидрографической службы Военно-Морского Флота, 1964
OCLC
on1140074133
Cartographic Data
Scale 1:25,000
(E 23°52ʹ00ʺ--E 24°09ʹ00ʺ/N 57°08ʹ00ʺ--N 56°54ʹ00ʺ).
Depth shown by soundings, isolines and gradient tints.
Title translation: Baltic Sea, port of Riga and the mouth of the Dvina (Daugava) River / Publication of the Office of the Hydrographic Service of the Navy ; Printed in 1964.
Greenwich meridian.
"No. 454" -- margins.
Also available on the Internet through the American Geographical Society Library Digital Map Collection.