At head of title: Polska Akademia Nauk. Oddział w Krakowie.
On p. facing t.p.: English title, Detection of rock voids by the method of measuring the vertical gradient of gravity in regions of compact settlement; Russian title, Obnaruzhivanie skalʹnykh pustot metodom izmerenii︠a︡ vertikalʹnogo gradienta sily ti︠a︡zhesti v raĭonakh sploshnoĭ gorodskoĭ zastroĭki.