@book{6920,
	author = {Hobson, Ernest William, and Greenhill, G.},
	title = {A treatise on plane trigonometry },
	publisher = {University Press,},
	year = {c1891.},
	address = {Cambridge :},
	note = {Rare Book copy: [Sir] A[lfred] G[eorge] Greenhill's copy, with his autograph and manuscript note, "From the Syndics (and the Author)."}
}