Silalahi AB, Trides T, Nugroho W, Oktaviani R, Juvensius Pontusi A. STUDI KEKUATAN BATULEMPUNG DENGAN UJI SCHMIDT HAMMER DAN UNIAXIAL COMPRESSIVE STRENGTH FORMASI BALIKPAPAN DAN PULAUBALANG SAMARINDA, KALIMANTAN TIMUR: STUDY OF CLAYSTONE STRENGTH USING THE SCHMIDT HAMMER TEST AND UNIAXIAL COMPRESSIVE STRENGTH BALIKPAPAN AND PULAUBALANG FORMATIONS IN SAMARINDA, EAST KALIMANTAN. JTP [Internet]. 2023 Aug. 31 [cited 2024 Dec. 22];23(2):47-52. Available from: https://e-journal.upr.ac.id/index.php/JTP/article/view/10536