[Suomen topografinen kartta mittakaavassa 1:20 000].
Finland.Maanmittaushallitus.Kartografinen toimisto.
[Helsinki?] : Maanmittaushallituksen kartografinen toimisto,
1930-
Relief shown by contours and spot heights. Relief also shown by landform drawings on some sheets.
Some sheets cover parts of Finland later ceded to Russian S.F.S.R. (U.S.S.R.).
Common title devised by cataloger.
Sheets individually subtitled and numbered in upper margin, e.g.: 769/448 Pitkäjärvi --772/457 Mustatunturi.
Unidentified grid.
Some sheets reprinted at later dates, e.g.: Tilgmannin kivipaino 1941 -- Tilgmannin offsetpaino Helsinki 1941.
Includes notes, sheet-index map, and slope diagram.
Interfiled with later series titled: Peruskartta.
Graphic index with maps.