Journals / Maden Tetkik ve Arama Dergisi / 1952 / Cilt: 42 - Sayı: 43Erosion of the Namurian During the Westphalian B-C in the Zonguldak Coal Field (Turkey)JournalMaden Tetkik ve Arama DergisiIssue1952 · Cilt: 42 - Sayı: 43Pages—DOI—