返回Google圖書搜尋

Permissible Electrically Operated Post Drills and Drilling Machines

出版	U.S. Department of the Interior, Bureau of Mines, 1938
URL	http://books.google.com.hk/books?id=vdGo4ZG0SRAC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN