@book{22067,
	author = {Blackford, Mansel G.},
	title = {Pathways to the Present},
	url = {https://library.oapen.org/bitstream/20.500.12657/30229/1/648349.pdf||https://library.oapen.org/bitstream/20.500.12657/30229/1/648349.pdf||https://library.oapen.org/bitstream/20.500.12657/30229/1/648349.pdf}
}