Jin gang shi zuan tou yu kuo kong qi
By: Zhao Erxin ... [et al.] bian ; [Di zhi bu shu kan bian ji shi bian ji].
Contributors: Zhao, Erxin.; China. Di zhi bu. Shu kan bian ji shi.
Edition: Beijing di 1 ban
Publisher: Di zhi chu ban she; Xin hua shu dian Beijing fa xing suo fa xing
Published: 1982
Place of publication: Beijing
Language: chi
Number of pages: 211
Subjects: Rock-drills.