@book{90997,
	author = {Columbus, Christopher.},
	title = {A letter of Christopher Columbus.},
	publisher = {s.n.,},
	year = {after 29 Apr. 1493]},
	address = {[S.l.,},
	note = {Caption title.},
	url = {http://hdl.loc.gov/loc.rbc/rbesp.0001_0015}
}