Brief Introduction to Substitute Resources of Brick Clay in Shandong Province
zhang shang-kun 1; 2 ; wang hong 2; wang min 2; zhang zeng-qi 2; xu zhong-yi 3(1. china geology university; beijing 100037; china; 2. shandong institute and laboratory of geological sciences; shandong jinan 250013; china; 3. shandong geological exploration bureau; shandong jinan 250013; china)