Authors Year Title
Ruzhencev 1936 Novye dannye po stratigrafii kamennougol'nykh i nizhnepermskikh otlozhenii Orenburgskoi i Aktiubinskoi oblastei. [In Russian with English summary: New data of the stratigraphy of the ....  (see Note).
Problemy Sovietskoi Geologii, 1936, 6: 470-506, 3 tab., 1 map.