@book{114715,
	author = {Calvert, Albert Frederick,},
	title = {Nigeria and its tin fields},
	publisher = {Project Gutenberg,},
	year = {2024},
	address = {Salt Lake City, UT :},
	note = {Release date is 2024-07-08},
	url = {https://archive.org/details/nigeriaitstinfie00calv/page/n5/mode/2up}
}