@book{287236,
	author = {Doyle, Charles, and Library of Congress.},
	title = {National security letters :},
	publisher = {Congressional Research Service,},
	year = {2019-},
	series = {Report / Congressional Research Service ;},
	address = {[Washington, D.C.] :},
	edition = {[Library of Congress public edition].},
	note = {"Updated June 30, 2011."},
	url = {https://purl.fdlp.gov/GPO/gpo124176}
}