@book{40521,
	author = {Sidders, P. A.,},
	title = {Guide to world screw threads /},
	publisher = {Industrial Press,},
	year = {1969.},
	address = {New York :},
	note = {Sixth  and 15th ed. entered under C. E. Allen have title: Machinery's screw thread  book. 20th ed. entered under title: Machinery's screw thread book.}
}