@book{7539,
	author = {Walker, Philip.},
	title = {How to raise silk-worms.},
	publisher = {Gov't. Print. Off.,},
	year = {1890.},
	series = {United States. Dept. of Agriculture. Silk Section. Bulletin},
	address = {Washington,},
	url = {http://hdl.loc.gov/loc.gdc/scd0001.00028429046}
}